By oxidative stress it is meant the generation of free radicals or radicalic compounds, which causes injury both of the cell and that of the surrounding tissue (Pathophysiology: the biological basis for disease in adults and children, McCance & Huether 1998 pages 48-54).

By endothelial dysfunctions it is meant those relating to the vasal endothelium. The damage of the vasal endothelium is known as one of those important events that can cause a series of pathological processes affecting various organs and body apparatuses, as described hereinafter (Pathophysiology: The <BR> <BR> <BR> <BR> <BR> biological basis for disease in adults and children, McCance & Huether 1998 page 1025).

As known, the oxidative stress and/or the endothelial dysfunctions are associated to various pathologies as reported hereinafter. The oxidative stress can also be caused by toxicity of a great variety of drugs, which significantly af- fects their performances.

Said pathological events are of a chronic, debilitating character and are very ofthen typical of the elderly. As already said, in said pathological conditions the drugs used show a remarkably worsened performance.

Examples of pathological situations caused by the oxida- tive stress and/or by the endothelial dysfunctions, or present in elderly, are the following: -For the cardiovascular system: myocardial and vascular ischaemia in general, hypertension, stroke, arterioscle- rosis, etc.

-For the connective tissue: rheumatoid arthritis and con- nected inflammatory diseases, etc.

-For the pulmonary system: asthma and connected. inflammatory diseases, etc.

-For the gastrointestinal system: ulcerative and non ul- cerative dyspepsias, intestinal inflammatory diseases, etc.

-For the central nervous system: Alzheimer disease, etc.

-For the urogenital system: impotence, incontinence.

-For the cutaneous system: eczema, neurodermatitis, acne.

-The infective diseases in general (ref.: Schwarz-KB, Brady "Oxidative stress during viral infection: A review"Free radical Biol. Med. 21/5,641-649 1996).

Further the ageing process can be considered as a true pathologic condition (ref. Pathophysiology: the biological basis for disease in adults and children, pages 71-77).

The known drugs when administered to patients having pathologies associated to oxidative stress and/or endothelial dysfunctions, show a lower activity and/or higher toxicity.

This happens for example for drugs such as the antiinflammatory, cardiovascular drugs, respiratory apparatus drugs, central nervous system drugs, bone system drugs, antibiotics, urogenital, endocrine drugs, etc.

Drug research is directed to find new molecules having an improved therapeutic index (efficacy/toxicity ratio) or a lower risk/benefit ratio, also for pathological conditions as those above mentioned, wherein the therapeutic index of a great number of drugs results lowered. In fact in the above mentioned conditions of oxidative stress and/or endothelial dysfunctions, many drugs show a lower activity and/or higher toxicity.

For instance antiinflammatory drugs, such as NSAIDs and anticolitic drugs, such as 5-aminosalicylic acid and its derivatives, show the following drawbacks herein mentioned.

NSAIDs result toxic particularly when the organism is debilitated or affected by morbid conditions associated to oxidative stress. Said conditions are for example the following: age, pre-existing ulcer, pre-existing gastric bleeding, debilitating chronic diseases such as in particular those affecting cardiovascular, renal apparatuses, the haematic crasis, etc. ("Misoprostol reduces serious gastrointestinal complications in patients with rheumatoid arthritis receiving non-steroidal anti-inflammatory drugs. A randomized, double blind, placebo-controlled trial."F. E. Silverstein et A1., Ann.

Intern. Med. 123/4, 241-9,1995; Martindale 31a ed. 1996, pag.

73, Current Medical Diagnosis and Treatment 1998, pages 431 and 794).

The administration of anti-inflammatory drugs to patients in the above mentioned pathological conditions can be made only at doses lower than those used in therapy in order to avoid remarkable toxicity phenomena. Thus anti-inflammatory activity results poor.

Beta-blockers, used for the angina, hypertension and cardiac arrhythmia treatment, show side effects towards the respiratory apparatus (dyspnoea, bronchoconstriction), and therefore they can cause problems in patients affected by pathologies to said organs (asthma, bronchitis). Therefore be- ta-blockers can even worsen respiratory diseases such as asthma. Therefore in asthmatic patients reduced doses of said drugs must be used in order not to jeopardize even more the respiratory functionality. Thus the efficacy of the beta- blockers results very reduced.

Antithrombotics, such as for example dipyridamole, aspirin, etc., used for the prophylaxis of thrombotic phenomena, have the same drawbacks. In patients affected by pathologies connecte to oxidative stress and/or endothelial dysfunctions, the therapeutic action or the tolerability of these drugs, as in the case of aspirin, is greatly reduced.

Bronchodilators for example salbutamol, etc., are used in the asthma and bronchitis treatment and drugs active on the cholinergic system are used in pathologies such as urinary incontinence. Their administration can produce similar side effects affecting the cardiovascular apparatus, causing problems both to cardiopathic and to hypertensive patients.

Cardiopathies and hypertension are pathologies associated, as above said, to the oxidative stress and/or endothelial dysfunctions. Also these drugs show the same drawbacks as those above mentioned.

Expectorant and mucolytic drugs, which are used in the therapy of inflammatory states of the respiratory organs, show drawbacks in patients affected by the above described condi- tions. Their administration can give rise to heartburn and gastric irritability, particularly in the elderly.

Bone resorption inhibitors, such as diphosphonates (for example alendronate, etc.) are drugs showing high gastro- intestinal toxicity. Therefore also these drugs can show the same drawbacks as those above mentioned.

Phosphodiesterase inhibitors, such as for example sildenafil, zaprinast, used in the cardiovascular and respiratory system diseases, are charaterized by similar problems as to tolerability and/or efficacy in the mentioned pathological conditions of oxidative stress and/or endothelial dysfunctions.

Antiallergic drugs, for example cetirizine, montelukast, etc. show similar problems in the mentioned pathological conditions, particularly for that it concerns their efficacy.

Anti-angiotensin drugs, f. i. ACE-inhibitors, for example enalapril, captopril, etc., and receptor inhibitors, for example losartan, etc., are used in the cardiovascular disease treatment. Their drawback is to give side effects to the respiratory apparatus (i. e. cough, etc.) in the above mentioned pathological conditions.

Antidiabetic drugs, both of the insulin-sensitizing and of hypoglycaemizing type, such as for example sulphonylureas, tolbutamide, glypiride, glyclazide, glyburide, nicotinamide etc., are ineffective in the prophylaxis of diabetic complications. Their administration can give rise to side effects, such as for example gastric lesions. These phenomena become more intense in the pathological conditions above mentioned.

Antibiotics, for example ampicillin, clarihtromycin, etc., and antiviral drugs, acyclovir, etc., show problems as regards their tolerability, for example they cause gastro-intestinal irritability.

Antitumoral drugs, for example doxorubicin, daunorubicin, cisplatinum, etc., have high toxicity, towards different organs, among which are stomach and intestine. Said toxicity is further worsened in the above mentioned pathologies of oxidative stress and/or endothelial dysfunctions.

Antidementia drugs for example nicotine and colino- mimetics, are characterized by a poor tolerability especially in the above mentioned pathologies.

Drugs having a steroidal structure which are used in the therapy of acute (asthma, etc.) or chronic diseases (intestinal, hepatic, respiratory diseases, female reproductive apparatus diseases, cutaneous diseases, etc.) are characterized by marked toxic effects affecting various organs, particularly in the above mentioned oxidative stress conditions.

The class of steroidal drugs, among which hydrocortisone, cortisone, prednisone, prednisolone, fludrocortisone, desoxi- corticosterone, methylprednisolone, triamcinolone, para- methasone, betamethasone, dexamethasone, triamcinolone acetonide, fluocinolone acetonide, beclomethasone, acetoxy- pregnelone, etc., has remarkable farmaco-toxicological effects on various organs, and for this reason both their clinical use and its interruption cause a series of side effects, some of which very serious. See for example Goodman & Gilman,"The pharmaceutical Basis of Therapeutics"9°ed., pag. 1459-1465, 1996.

'Among said toxic effects can be mentioned those affecting the bone tissue leading to an altered cellular metabolism and an high osteoporosis incidence; those affecting the cardiovascular system, generating an hypertensive response; those affecting the gastrointestinal apparatus giving gastric damages.

See for example Martindale"The extrapharmacopoeia", 30th ed., pag. 712-723,1993.

To the class of steroidal drugs belong also biliary acids, that have been used in the therapy of hepatic dysfunctions and in biliary colics. Ursodesoxycholic acid is also used in some hepatic dysfunctions (hepatic cirrhosis of biliary origin, etc.). Their tolerability is strongly worsened in the presence of gastrointestinal complications (chronic hepatic damage, peptic ulcer, intestinal inflammation, etc.). Also in the case of biliary acids the oxidative stress remarkably affects drug performance: both the efficacy and the tolerability of chenodeoxycholic and ursodesoxycholic acids are significantly reduced. In particular the unwanted effects on liver are found exalted. Among the steroidal compounds can be mentioned also estrogens for the treatment of dislipidaemias, hormonal dysfunctions, female apparatus tumours treatment can be -mentioned. Also said steroids show side effects as above mentioned, in particular at the hepatic level.

According to the above mentioned prior art it seems almost impossible to separate therapeutic activity from side effects, see Goodman et al, above mentioned, at p. 1474.

The need was felt to have available drugs showing an improved therapeutic performance, i. e. endowed both of a lower toxicity and/or higher efficacy, so that they could be administered to patients in morbid conditions of oxidative stress and/or endothelial dysfunctions, without showing the drawbacks of the drugs of the prior art.

It has now surprisingly and unexpectedly found that the aforementioned problems evidenced the administration of drugs, to patients affected by oxidative stress and/or endothelial dysfunctions, or to the elderly in general, are solved by a new class of drugs as described hereinafter.

An object of the invention are compounds or their salts having the following general formula (I): A-B (I) wherein: A = R-T1-, wherein R is the drug radical and T1 = (CO) t or (X) t,, wherein X = O, S, NRlc RlC is H or a linear or branched alkyl, having from 1 to 5 carbon atoms, or a free valence, t and t'are integers and equal to zero or 1, with the proviso that t = 1 when t'= 0 ; t = 0 when t'= 1; B =-TB-X2 wherein TB= (CO) when t = 0, TB = X when t'= 0, X being as above defined; X2, monovalent radical, is such that the corresponding precursor of B meets test 5 and/or test 4; said precursor of formula-TB-X2, wherein the TB free valence is saturated with-OZ or Z wherein Z = H or Rlat Ria Cl-Clo being = linear or when possible branched alkyl, preferably C1-C5, or with-ZI-N-ZII, ZI and ZII being equal or I different and have the Z values, depending on whether TB = CO or X, in connection with the t, t'values; with the proviso that: the drug A = R--T1-, wherein the free valence is saturated as hereinafter mentioned: -when t'= 0 with: -O-Z wherein Z = H or Rla as above defined, or with ZI-N-ZII, I ZI and ZII being as above defined, -when t = 0 with X-Z, wherein X and Z as above defined, is such as to meet at least one of following tests 1-3; --wherein test 1 (NEM) is a test in vivo carried out on four groups of rats (each formed by 10 rats), the controls (two groups) and the treated (two groups) of which one group of the controls and one group of the treated respectively are administered with one dose of 25 mg/kg s. c. of N-ethylmaleimide (NEM), the controls being treated with the carrier and the treated groups with the carrier + the drug of formula A = R- T1-wherein the free valence is saturated as above indicated, administering the drug at a dose equivalent to the maximum one tolerated by the rats that did not receive NEM, i. e. the highest dose administrable to the animal at which there is no manifest toxicity, i. e. such as to be symptomatologically observable; the drug complies with test 1, i. e. the drug can be used to prepare the compounds of general formula (I) and (II), when the group of rats treated with NEM + carrier + drug shows gastrointestinal damages, or in the group treated with NEM + carrier + drug are observed gastrointestinal damages greater than those of the group treated with the carrier, or of the group treated with the carrier + drug, or of the group treated with the carrier + NEM; wherein test 2 (CIP) is a test in vitro wherein human endothelial cells from the umbilical vein are harvested under standard conditions, then divided into two groups (each group replicated five times), of which one is treated with a mixture of the drug 10-4 M concentration in the culture medium, the _other group with the carrier; then cumene hydroperoxide (CIP-) having a 5 mM concentration in the culture medium is added to each of the two groups; the drug meets test 2, i. e. the drug can be used to prepare the compounds of general formula (I) and (II), if a statistically significant inhibition of the apoptosis (cellular damage) induced by CIP is not obtained with p < 0.01 with respect to the group treated with the carrier and CIP; wherein test 3 (L-NAME) is a test in vivo carried out on four groups of rats (each group formed by 10 rats) for 4 weeks and receiving drinking water, the controls (two groups) and the treated (two groups), of which one group of the controls and of the treated respectively receives in the above 4 weeks drinking water added of N-O-nitro-L-arginine methyl ester (L-NAME) at a concentration of 400 mg/litre, the controls in the 4 weeks being administered with the carrier and the treated in the 4 weeks with the carrier + the drug, administering the carrier or the drug + carrier once a day, the drug being administered at the maximum dose tolerated by the group of rats not pretreated with L-NAME, i. e., the highest dose administrable to animals at which no manifest toxicity appears, i. e. such as to be symptomatologically observable; after the said 4 weeks, the water supply is stopped for 24 hours and then sacrified, determining the blood pressure 1 hour before sacrifice, and after sacrifice of the rats determining the plasma glutamic -pyruvic transaminase (GPT) after sacrifice, and examining the gastric tissue; the drug meets test 3, i. e. the drug can be used to prepare the compounds of general formula (I) and (II), when in the group of rats treated with L-NAME + carrier + drug, greater hepatic damages (determined as higher values of GPT) and/or gastric and/or cardiovascular damages (determined as higher values of blood-pressure) are found in comparison in comparison respectively with the group treated with the carrier alone, or with the group treated with the carrier + drug, or with the group treated with the carrier + L-NAME; wherein test 4 is an analytical determination carried out by adding portions of methanol solutions of the precursor of B at a 10-4 M concentration, to a methanol solution of DPPH (2,2- diphenyl-1-picryl hydrazyl-free radical); after having maintained the solution at room temperature away from light for 30 minutes, it is read the absorbance at the wave length of 517 nm of the test solution and of a solution containing only DPPH in the same amount as in the test solution; and then the inhibition induced by the precursor towards the radical production by DPPH is calculated as a percentage by means of the following formula: (1-AS/Ac) X100 wherein As and Ac are respectively the absorbance values of the solution containing the test compound + DPPH and that of the solution containing only DPPH; the acceptance criterium of the compounds according to this test is the following: test 4 is met by B precursor compounds if the inhibition percentage as above defined is higher than or equal to 50%; wherein test 5 is the following: it is an analytical determination carried out by adding aliquots of 10-4 M methanol solutions of the precursor of B having the free valence saturated as above indicated, to a solution formed by admixing a 2 mM solution of desoxyribose in water with 100 mM of phosphate buffer and 1 mM of the salt FeII(NH4)2(SO4)2; after having thermostatted the solution at 37°C for one hour, are added, in the order, aliquots of aqueous solutions of trichloroacetic acid 2.8% and of thiobarbituric acid 0.5 M, heating is effected at 100°C for 15 minutes and the absorbance of the tested solutions is then read at 532 nm ; the inhibition induced by the precursor of B or B1 or C--T-Y-H in the confront of radical production by Fe is calculated as a percentage by means of the following formula: (1-As/Ac) X100 wherein As and Ac are respectively the absorbance values of the solution containing the tested compound and the iron salt and that of the solution containing only the iron salt, the compound meets test 5 when the inhibition percentage as above defined of the precursor of B is higher than or equal to 50%.

Preferably the compound precursor of B which meets test 5 is selected from the following compounds: -Aminoacids: aspartic acid (PI), histidine (PII),- 5-hydroxytryptophan (PIII), 4-thiazolidincarboxylic acid (PIV), 2-oxo-4-thiazolidincarboxylic acid (PV) (PV) mono and polyalcohols or thiols: 2-thiouracil (QI), 2-mercaptoethanol (QII), esperidine (QIII), secalciferol (QIV), 1-a-OH vitamin D2 (QV), flocalcitriol (QVI), 22-oxacalcitriol (QVII), the vitamin D3 derivative esterified with the vitamin A radical (QVIII), the compound of formula (QIX), 24,28-methylene- la-hydroxyvitamin D2 (QX) the compound derived from 1α, 25- dihydroxyvitamin D2 (QXI), 2-mercaptoimidazol (QXII) acid(RI)-succinic wherein n°3, equal to or different from each other, are an integer equal to zero or one; n3, equal to or different from each other, are integers from zero to three; W, equal to or different from each other, are selected among the following: HX with X as above defined, COOH, R', OR' wherein R'is a linear or branched when possible alkyl having from 1 to 20 carbon atoms, preferably from 1 to 6 carbon atoms; Rf, ORf wherein Rf is as R'but containing at least one halogen atom instead of H, preferably F; at least one of the W radicals is XH, when the drug reactive function is a carboxyl; or COOH when the drug reactive function is XH; when n°3 = 0 if n3 is different from zero then the free valence of the n3 group is saturated with one of the following substituents: R', OR', Rf, ORf, H; when n°3 = 0 and n3 = 0, the free valence is saturated with H.

Preferably the precursor compound of B which meets test 4 is selected from the following classes of compounds: -Aminoacids, selected from the following: L-carnosine (for- mula CI), anserine (CII), selenocysteine (CIII), se- lenomethionine (CIV), penicillamine (CV), N-acetyl- penicillamine (CVI), cysteine (CVII), N-acetylcysteine (CVIII), glutathione (CIX) or its esters, preferably ethyl or isopropyl ester: For the compounds (CV), (CVI), (CVII) and (CVIII) wherein a SH group is present, the corresponding compound SN (O) s, wherein s is 1 or 2, can also be used instead of SH; hydroxyacids, selected from the following: gallic acid (formula DI), ferulic acid (DII), gentisic acid (DIII), citric acid (DIV), caffeic acid (DV), hydrocaffeic acid (DVI), p-coumaric acid (DVII), vanillic acid (DVIII), chlorogenic acid (DIX), kynurenic acid (DX), syringic acid (DXI): Aromatic and heterocyclic mono-and polyalcohols, selected from the following: nordihydroguaiaretic acid (EI), quercetin (EII), catechin (EIII), kaempferol (EIV), sulphurethyne (EV), ascorbic acid (EVI), isoascorbic acid (EVII), hydroquinone (EVIII), gossypol (EIX), reductic acid (EX), methoxyhydroquinone (EXI), hydroxyhydroquinone (EXII), propyl gallate (EXIII), saccharose (EXIV), vita- min E (EXV), vitamin A (EXVI), 8-quinolol (EXVII), 3- tert-butyl-4-hydroxyanisole (EXVIII), 3-hydroxyflavone (EXIX), 3,5-tert-butyl-p-hydroxytoluene (EXX), p-tert- butyl phenol (EXXI), timolol (EXXII), xibornol (EXXIII), 3,5-di-ter-butyl-4-hydroxybenzyl-thioglycolate (EXXIV), 4'-hydroxybutyranilide (EXXV), guaiacol (EXXVI), tocol (EXXVII), isoeugenol (EXXVIII), eugenol (EXXIX), pipe- ronyl alcohol (EXXX), allopurinol (EXXXI), conyferyl alcohol (EXXXII), 4-hydroxyphenetyl alcohol (EXXXIII), p- coumaric alcohol (EXXXIV), curcumin (EXXXV): aromatic and heterocyclic amines, selected from the following: N, N'-diphenyl-p-phenylenediamine (MI), ethoxyquin (MII), thionine (MIII), hydroxyurea (MIV): Compounds containing at least a free acid function, selected from the following: 3,3'-thiodipropionic acid (NI), fumaric acid (NII), dihydroxymaleic acid (NIII), thioctic acid (NIV), edetic acid (NV), bilirubin (NVI), 3,4-methylendioxycinnamic acid (NVII), piperonylic acid (NVIII): The drug and B precursor compounds are prepared according to the known methods in the prior art and described, for example, in"The Merck Index, 12a Ed. (1996), herein incorporated by reference.

The vitamin D3 derivative with retinoic acid (QVIII) is prepared as described in JP 93039261 (ref. C. A. 119 117617); the formula (QIX) compound according to EP 562497; 24,28- methylene-la-hydroxyvitamin D2 (QX) according to EP 578494; the derivative compound of dehydroxyvitamin D2 (QXI) according to EP 549318.

The preferred B compounds are those meeting test 4.

The tests carried out to identify the drug precursor of R radical of the formula (I) are in detail the following: Test 1 (NEM): evaluation of the gastrointestinal damage from oxidative stress induced by free radicals formed following administration of N-ethylmaleimide (NEM) (H. G. Utley, F.

Bernheim, P. Hochstein"Effects ofsulphydrilreagentson pe- roxidation in microsomes"Archiv. Biochem. Biophys. 118,29-32 1967).

The animals (rats) are distributed in the following groups (no. 10 animals for group): A) Control groups: 1° group: treatment: only carrier (aqueous suspension 1% w/v of carboxymethylcellulose, dose: 5 ml/Kg when the drug is administered by os, or a physiologic solution when parenterally administered, i. e. by subcutaneous, intraperitoneal, intravenous or intermuscularroute), 2° group: treatment: carrier as above defined + NEM, B) Groups treated with the drug: group 1: treatment: carrier + drug, gruppo II: treatment: carrier + drug + NEM.

The administration routes are those known for the drug, and can be the oral or subcutaneous, intraperitoneal, intravenous or intramuscular route.

The NEM dose is of 25 mg/kg in physiologic solution (sub cutaneous route) and the drug is administered one hour later, in suspension in the carrier, as a single dose which corresponds to the maximum one, or the highest still tolerated by the animals of the group of rats not pretreated with NEM, i. e. the highest administrable dose to said group at which there is no manifest toxicity in the animals, defined as a toxicity that is clearly recognizable for its symptoms. The animals are sacrificed after 24 hours and then one proceeds to the evaluation of the damage to the gastrointestinal mucosa.

The drug meets test 1, i. e. it can be used to prepare the compounds of general formula (I) and (II), when the group of rats treated with NEM + carrier + drug shows gastrointestinal damages, or in said group the gastrointestinal damages noticed are greater than those shown by the group treated with the carrier alone, or the group treated with carrier + drug, or the group treated with carrier + NEM, even though the drug pharmacotherapeutic efficacy, assayed by using specific tests, is not significantly reduced.

Test 2 (CIP): Protection parameter of endothelial cell against the oxidative stress induced by cumene hydroperoxide (CIP).

Human endothelial cells of the umbilical vein are prepared according to an usual standard procedure. Fresh umbilical veins are filled with a 0.1% by weight collagenase solution and incubated at 37°C for 5 minutes.

Afterwards the veins are perfused with medium M 199 (GIBCO, Grand Island, NY) pH 7.4 further added of other sub- stances, as described in the examples. The cells are collected from the perfusate by centrifugation and harvested in culture flasks T-75, pretreated with human fibronectin. The cells are then harvested in the same medium, further added with 10 ng/ml of bovine hypothalamic growth factor. When the cells of the primary cell culture (i. e. that directly obtained from ex-vivo) form a single layer of confluent cells (about 8,000,000 cells/flask), the culture is stopped and the layers washed and trypsinized. The cellular suspensions are transferred into the wells of a cell culture plate having 24 wells, half of which is then additioned with the same culture medium containing the drug at a 10-4M concentration, and harvested in a thermostat at 37°C at a constant moisture. Only the cells coming from said first sub-cultures are used for the experiments with cumene hydroperoxide (CIP). The cells are identified as endothelial cells by morphological examination and by their specific immunological reaction towards factor VIII; said cultures did not show any contaminations from myocytes or fibroblasts.

Before starting the test, the cellular culture medium is removed and the cellular layers are carefully washed with a physiologic solution at a temperature of 37°C. The wells of the culture plate are then incubated for one hour with CIP at a 5 mM concentration in the culture medium. The evaluation of cellular damage (apoptosis) is carried out by determining the per cent variation of the DNA fragmentation with respect to the control group (treated with CIP alone), evaluating the fluorescence variation at the wave length of 405-450 nm. 5 replicates for each sample are carried out.

The drug meets the test, i. e. it can be used for preparing the compounds of general formula (I) and (II), when a statisti- cally significant inhibition of apoptosis (cellular damage) induced by CIP with respect to the group treated with CIP alone is not obtained at p < 0.01.

Test 3 (L-NAME): evaluation of the endothelial dysfunction induced by administration of L-NAME (N"-nitro-L-arginine-methyl ester) J. Clin. Investigation 90,278-281,1992.

The endothelial dysfunction is evaluated by determining the damage to the gastrointestinal mucosa, the hepatic damage and blood hypertension induced by administration of L-NAME.

The animals (rats) are divided in groups as herein below shown. The group receiving L-NAME is treated for 4 weeks with said compound dissolved at a concentration of 400 mg/litre in drinking water. The following groups are constituted (No. 10 animals for group): A) Control groups: 1° group : only carrier (aqueous suspension 1% w/v of carboxy- methylcellulose, dose: 5 ml/Kg when the drug is administered by os, phisiologic solution when administered parenterally), 2° group: carrier + L-NAME, B) Groups administered with the drug: 3° group: carrier + drug, 4° group: carrier + drug + L-NAME.

The administration routes are those known for the drug, and can be the oral or subcutaneous, intraperiteneal, intravenous or intramuscular route. The drug is administered at that dose which results the highest still tolerated by the animals of the group of rats not pretreated with L-NAME, i. e. the highest administrable dose at which there is no evident toxicity in the animals, i. e a toxicity recognizable for its symptoms. The drug is administered once a day for 4 weeks.

At the end of the four weeks treatment access to water is prevented and after 24 hours the animals are sacrificed.

One hour before the sacrifice blood-pressure is determined, and a blood pressure increase is taken as an evaluation of the damage to vascular endothelium. The damage to the gastric mucosa is evaluated as illustrated in test 1 (see example F1). The hepatic damage is determined by evaluation of the glutamic-pyruvic transaminase (GPT increase) after sacrifice.

The drug meets test 3, i. e. it can be used for preparing the compounds of general formula (I) and (II), when in the group of rats treated with L-NAME + drug + carrier it is found an higher hepatic damage (GPT) and/or an higher gastric damage and/or an higher cardiovascular (blood-pressure) damage in comparison to that of the group treated with the carrier alone, or of the group treated with carrier + drug, or of the group treated with carrier + L-NAME ; even if the drug pharmaco- therapeutic efficacy, assayed by specific tests, is not significantly reduced.

Under the conditions indicated in the above described in vivo tests 1 and 3 the therapeutic index of the drug is reduced since the usual doses at which the drug can be effective are no longer tolerated.

Test 4 is a colorimetric test which affords to establish whether the precursor of B inhibits the production of radicals from DPPH (2,2-diphenyl-1-picryl-hydrazyl) (M. S. Nenseter et A1., Atheroscler. Thromb. 15,1338-1344,1995). 100 AN solutions in methanol of the tested substances are prepared, and an aliquot of each of said solutions is added to a DPPH solution in methanol 0.1 M. After having stored the solutions at room temperature away from light for 30 minutes, their absorbances are read at the wave length of 517 nm, together with that of the corresponding DPPH solution at the same concentration. The absorbance decrease with respect to that of the solution of DPPH at the same concentration of the test solutions is determined. The effectiveness of the tested compound in inhibiting formation of radicals by DPPH is expressed by the following formula: (1-AS/Ac) X100 wherein As and Ac are respectively the absorbance values of the solution containing the test compound together with DPPH and of the solution containing only DPPH.

The compound precursor of B meets test 4 when the inhibition percentage of radical production from DPPH, expressed as a percentage according to the above equation, is higher than or equal to 50%.

Test 5 is a colorimetric test wherein 0.1 ml aliquots of 10-4 M methanolic solutions of the tested products are added to test tubes containing a solution formed by 0.2 ml of 2 mM deoxyribose, 0.4 ml of phosphate buffer pH 7.4 100 mM and 0.1 ml of 1 mM FeII (NH4) 2 (SO4) 2 in 2mM HC1. The test tubes are then maintained at 37°C for one hour. Then in each test tube are added, in the order, 0.5 ml of a 2.8% solution in tri- chloroacetic acid water and 0.5 ml of an aqueous 0.1 M solution of thiobarbituric acid. A reference blank is formed by adding to a test tube containing only the above described aqueous solution of reactants 0.1 ml of methanol. The test tubes are closed and heated in an oil bath at 100°C for 15 minutes. A pink coloration is developed the intensity of which is proportional to the quantity of deoxyribose undergone to radical oxidative degradation. The solutions are cooled at room temperature and their absorbances are read at 532 nm against the blank. The inhibition induced by the precursor of B in the confront of radical productionby Fe is determined by means of the following formula: (1-AS/Ac) X100 wherein As and Ac are respectively the absorbance values of the solution containing the tested compound + the iron salt and that of the solution containing only the iron salt, the compound satisfies test 5 when the inhibition percentage of radical production as above defined from the precursor of B is higher than or equal to 50%.

Unexpectedly the products of the invention of formula (I), under oxidative stress conditions, have an improved therapeutic index, compared with the precursor drugs.

For illustrative purposes the above mentioned tests are referred to the following compounds. See the Tables.

Test 1: precursor drug: indomethacin -Maximum administrable dose to rats: 7.5 mg/Kg p. o. By administering a higher dose a toxicity is manifested, characterized by enteropathy, tremor, sedation until death (within 24 hours).

-The group of rats treated with NEM + indomethacin at the above mentioned dose shows gastrointestinal damages.

Since indomethacin in the groups treated with NEM causes gastrointestinal damages, it meets test 1. Indomethacin can therefore be used as a drug for preparing the compounds (I) and (II) of the present invention.

Test 2: precursor drugs: indomethacin, paracetamol and mesala- mine Indomethacin and paracetamol meet test 2 since the cellular damage (apoptosis) inhibition induced by CIP is not significantly different with respect to that of the controls.

Therefore the above drugs can be used as drugs for preparing the compounds (I) and (II) of the present invention.

On the contrary mesalamine does not meet test 2, since it inhibits the apoptosis induced by CIP. Therefore mesalamine according to test 2 could not be used as a precursor to prepare the compounds (I) and (II) of the present invention. It has been however found that mesalamine submitted to test 1 causes gastrointestinal damages.

Thus also mesalamine can be used as a precursor for preparing the compounds (I) and (II) of the present invention.

Test 3 (L-NAME) precurosr drugs: paracetamol, simvastatin, omeprazole Paracetamol and simvastatin meet test 3 since they cause gastric and hepatic damages greater than those induced both by L-NAME + carrier and by the drug + carrier.

Therefore they can be used as precursors to prepare the compounds (I) and (II) of the present invention.

On the contrary it has been found that omeprazole neither causes gastric nor hepatic damages, nor influences blood- pressure. According to test 3 omeprazole could not be used as a precursor for preparing the compounds (I) and (II) of the present invention.

Test 4 (test for the compound precursor of B) N-acetylcysteine in said test inhibits of 100% the pro- duction of radicals induced by DPPH. Since said percentage is higher than the limit of 50%, said drug cannot. be used in the present invention as precursor of B.

4-Thiazolidin-carboxylic acid does not inhibit at any extent the production of radicals induced by DPPH (Table V).

Thus the drug does not meet test 4 as requested by the instant invention and it could be used as a precursor of B if it meets test 5.

Test 5 (test for the compound precursor of B) Table III relating to this test shows that the 4- thiazolidincarboxylic acid meets test 5 since the % inhibition is of 100%. Therefore the compound can be used as precursor of B.

Preferably in the invention compounds of formula (I), B contains free reactive functions, preferably selected from one or more of the following groups: XZ and ZI-N-ZII wherein I X, Z, ZI and ZII are as above defined, or COOH, =NH.

When B contains free reactive functions it can suitably be reacted with the compounds having formula (III) wherein the free valence is saturated with a reactive group such as to be able to react with the free reactive function of B: wherein: nIX is an integer between 0 and 3, preferably 1; RTIX, equal to or different from each other are H or a linear or branched C1-C4 alkyl; preferably RTIX'RTIX" are H.

Y3 is a saturated, unsaturated or aromatic heterocyclic ring containing at least one nitrogen atom, preferably one or two nitrogen atoms, said ring having 5 or 6 atoms. The Y3 ring can optionally have substituents, for example CH20H.

Y3 in formula (III) is preferably selected from the following: The most preferred of Y3 is Y12 (pyridyl).

The formula (I) compound salts are obtainable by reaction in organic solvent such as acetonitrile, tetrahydrofuran with an equimolecular amount of the corresponding organic or inorganic acid.

Examples of organic acids are: oxalic, tartaric, maleic, succinic, citric acids.

Examaples of inorganic acids are: nitric, hydrochloric, sulphoric, phosphoric acids.

The derivatives according to the invention can be used in the therapeutic-indications of the precursor drug, allowing to obtain the advantages exemplified hereinafter for some groups of these drugs: Anti-inflammatory drugs NSAIDs: the invention compounds result very well tolerated and effective, even when the organism is debilitated and finds under conditions of oxidative stress. Said drugs can be used also in those pathologies wherein inflammation plays a significant pathogenetic role, such as for instance, but not limited to, in cancer, asthma, miocardic infarction.

Adrenergic blockers, of a-or ß-blocker type: the action spectrum of the formula (I) compounds results wider than that of the starting drugs: to a direct action on the smooth musculature the inhibition of the nervous beta- adrenergic signals governing the contraction of the hematic ducts is associated. The side effects (dyspnoea, bronchoconstriction) affecting the respiratory apparatus are lower.

Antithrombotic drugs: the antiplatelet activity is potentiated and in the case of the aspirin derivatives the gastric tolerability is improved.

Bronchodilators and drugs active on the cholinergic system: the side effects affecting the cardio-vascular apparatus (tachycardia, hypertension) result lowered.

Expectorants and mucolytic drugs: the gastrointestinal tolerability results improved.

-Diphosphonates: the toxicity relating to the gastrointe- stinal tract is drastically lowered.

-Phosphodiesterase (PDE) inhibitors (bronchodilators): the therapeutic efficacy is improved, the dosage being equal; it is therefore possible, using the compounds of the invention to administer a lower dose of the drug and reduce the side effects.

-Anti leukotrienic drugs: better efficacy.

-ACE inhibitors: better therapeutic efficacy and lower side effects (dyspnoea, cough) affecting the respiratory apparatus.

-Antidiabetic drugs (insulin-sensitizing and hypoglycaemizing), antibiotic, antiviral, antitumoral, anticolitic drugs, drugs for the dementia therapy: better efficacy and/or tolerability.

The drugs which can be used as precursors in the general formula of the compounds of the invention are all those meeting at least one of the above mentioned tests Examples of precursor drugs which can be used are the following: For anti-inflammatory/analgesic drugs, the following can for example be mentioned: anti-inflammatory drugs: aceclofenac, acemetacin, acetylsali- cylic acid, 5-amino-acetylsalicylic acid, alclofenac, almi- noprofen, amfenac, bendazac, bermoprofen, a-bisabolol, bromfe- nac, bromosaligenin, bucloxic acid, butibufen, carprofen, cinmetacin, clidanac, clopirac, diclofenac sodium, diflunisal, ditazol, enfenamic acid, etodolac, etofenamate, felbinac, fenbufen, fenclozic acid, fendosal, fenoprofen, fentiazac, fepradinol, flufenamic acid, flunixin, flunoxaprofen, flur- biprofen, glucametacin, glycol salicylate, ibuprofen, ibupro- xam, indomethacin, indoprofen, isofezolac, isoxepac, isoxicam, ketoprofen, ketorolac, lornoxicam, loxoprofen, meclofenamic acid, mefenamic acid, meloxicam, mesalamine, metiazinic acid, mofezolac, naproxen, niflumic acid, oxaceprol, oxaprozin, oxyphenbutazone, parsalmide, perisoxal, phenyl ace- tylsalicylate, olsalazine, pyrazolac, piroxicam, pirprofen, pranoprofen, protizinic acid, salacetamide, salicilamide O- acetic acid, salicylsulphuric acid, salsalate, sulindac, supro- fen, suxibuzone, tenoxicam, tiaprofenic acid, tiaramide, tinoridine, tolfenamic acid, tolmetin, tropesin, xenbucin, ximoprofen, zaltoprofen, zomepirac, tomoxiprol; analgesic drugs: acetaminophen, acetaminosalol, aminoc- hlorthenoxazin, acetylsalicylic 2-amino-4-picoline acid, ace- tylsalicylsalicylic acid, anileridine, benoxaprofen benzylmor- phine, 5-bromosalicylic acetate acid, bucetin, buprenorphine, butorphanol, capsaicine, cinchophen, ciramadol, clometacin, clonixin, codeine, desomorphine, dezocine, dihydrocodeine, dihydromorphine, dimepheptanol, dipyrocetyl, eptazocine, ethoxazene, ethylmorphine, eugenol, floctafenine, fosfosal, glafenine, hydrocodone, hydromorphone, hydroxypethidine, ibu- fenac, p-lactophenetide, levorphanol, meptazinol, metazocine, metopon, morphine, nalbuphine, nicomorphine, norlevorphanol, normorphine, oxycodone, oxymorphone, pentazocine, phenazocine, phenocoll, phenoperidine, phenylbutazone, phenylsalicylate, phenylramidol, salicin, salicylamide, tiorphan, tramadol, dia- cerein, actarit; for respiratory and urogenital apparatus drugs (bronchodilators and drugs active on the cholinergic system, expectorants/mucolytics, antiasthmatic/antiallergic antihi- staminic drugs), the following can be mentioned: bronchodilators and drugs active on the cholinergic system: acefylline, albuterol, bambuterol, bamifylline, bevoniummethyl sulphate, bitolterol, carbuterol, clenbuterol, chlorprenaline, dioxethedrine, diphylline, ephedrine, epinephrine, eprozinol, etafredine, ethylnorepinephrine, etofylline, fenoterol, flutoprium bromide, hexoprenaline, ipratropium bromide, isoetharine, isoprotenerol, mabuterol, metaproterenol, oxybutynin, oxitropium bromide, pirbuterol, procaterol, protokylol, proxyphylline, reproterol, rimiterol, salmeterol, soterenol, terbutaline, 1-teobromineacetic acid, tiotropium bromide, tretoquinol, tulobuterol, zaprinast, cyclodrine, NS- 21,2-hydroxy-2, 2-diphenyl-N- (1, 2, 3, 6-tetra hydro-pyridin-4- ylmethyl) acetamide; expectorant/mucolytic drugs: ambroxol, bromexine, domio- dol, erdosteine, guaiacol, guaifenesin, iodinated glycerol, letosteine, mesna, sobrerol, stepronin, terpin, tiopronin; antiasthmatic/antiallergic antihistaminic drugs: acrivastine, alloclamide, amlexanox, cetirizine, clobenzepam, chromoglycate, chromolyn, epinastine, fexofenadine, formoterol, histamine, hydroxyzine, levocabastine, lodoxamide, mabuterol, metron s, montelukast, nedocromil, repirinast, seratrodast, suplatast tosylate, terfenadine, tiaramide, urushiol, bromhexine; for cardiovascular drugs (ACE-inhibitors, beta-blockers, antithrombotic and vasodilator drugs, antidiabetic and hypo- glycemic drugs), the following can be mentioned: ACE-inhibitors: alacepril, benazepril, captopril, cero- napril, cilazapril, delapril, enalapril, enalaprilat, fo- sinopril, imidapril, lisinopril, losartan, moveltipril, na- phthopidil, perindopril, quinapril, ramipril, spirapril, temo- capril, trandolapril, urapidil; beta-blockers: acebutolol, alprenolol, amosulalol, aroti- nolol, atenolol, betaxolol, bevantolol, bucumolol, bufetolol, bufuralol, bunitrolol, bupranolol, butofilol, carazolol, car- teolol, carvedilol, celiprolol, cetamolol, dilevalol, epanolol, esmolol, indenolol, labetalol, mepindolol, metipranolol, metoprolol, moprolol, nadolol, nadoxolol, nebivolol, nifenalol, nipridalol, oxprenolol, penbutolol, pindolol, practolol, pronethalol, propranolol, sotalol, sulfinalol, talinolol, ter- tatolol, tilisolol, timolol, toliprolol, xibenolol; antithrombotic and vasoactive drugs: acetorphan, acetylsa- licylic acid, argatroban, bamethan, benfurodil hemisuccinate, benziodarone, betahistine, brovincamine, bufeniode, citicoline, clobenfurol, clopidogrel, cyclandelate, dalteparin, dipyrida- mole, droprenilamine, enoxaparin, fendiline, ifenprodil, iloprost, indobufen, isbogrel, isoxsuprine, heparin, lamifiban, midrodine, nadroparin, nicotinyl alcohol, nylidrin, ozagrel, perhexiline, phenylpropanolamine, prenylamine, papaveroline, reviparin sodium salt, ridogrel, suloctidil, tinofedrine, tinzaparin, triflusal, xanthinol niacinate; antidiabetic drugs: acarbose, carbutamide, glibornuride glybuthiazol (e), miglitol, repaglinide, troglitazone, 1-butyl- 3-metanyl-urea, tolrestat, nicotinamide; for antitumoral drugs, the following can be mentioned: ancitabine, anthramycin, azacitidine, azaserine, 6-azauridine, bicalutamide, carubicin, carzinophilin, chlorambucil, chlorozotocin, cytarabine, daunorubicin, defosfamide, deme- colcine, denopterin, 6-diazo-5-oxo-L-norleucine, docetaxel, doxifluridine, doxorubicin, droloxifene, edatrexate, eflorni- thine, enocitabine, epirubicin, epitiostanol, etanidazole, etoposide, fenretinide, fludarabine, fluorouracil, gemcitabi- ne, hexestrol, idarubicin, lonidamine, mannomustine, melphalan, menogaril, 6-mercaptopurine, methotrexate, mitobronitol, mitolactol, mitomycins, mitoxantrone, mopidamol, mycophenolic acid, ninopterin, nogalamycin, paclitaxel, pentostatin, pira- rubicin, piritrexim, plicamycin, podophyllic acid, porfimer sodium, porfiromycin, propagermanium, puromycin, ranimustine, retinoic acid, roquinimex, streptonigrin, streptozocin, te- niposide, tenuazonic acid, thiamiprine, thioguanine, tomudex, topotecan, trimetrexate, tubercidin, ubenimex, vinblastine, vincristine, vindesine, vinorelbine, zorubicin; for antiulcer drugs the following can be mentioned: e- acetamidocaproic acid, arbaprostil, cetraxate, cimetidine, eca- bet, enprostil, esaprazole, irsogladine, misoprostol, ome- prazole, ornoprostil, pantoprazole, plaunotol, rioprostil, rosaprostol, rotraxate, sofalcone, trimoprostil; among anti-hyperlip=demic drugs (statines) the following can be mentioned: atorvastatin, cilastatin, dermostatin, fluvastatin, lovastatin, mevastatin, nystatin, pentostatin, pepstatin, privastatin sodium, simvastatin; among antibiotic/antiviral drugs the following can be me- ntioned: antibiotics: amdinocillin, amoxicillin, ampicillin, apal- cillin, apicycline, aspoxicillin, azidamfenicol, azidocillin, azlocillin, aztreonam, benzoylpas, benzyl penicillinic acid, biapenem, bicozamycin, capreomycin, carbenicillin, carindacillin, carumonam, cefaclor, cefadroxil, cefamandole, cefatrizine, cefazedone, cefazolin, cefbuperazone, cefclidin, cefdinir, cefditoren, cefepime, cefetamet, cefixime, cefmeno- xime, cefmetazole, cefminox, cefodizime, cefonicid, cefopera- zone, ceforanide, cefotaxime., cefotetan, cefotiam, cefoxitin, cefozopran, cefpimizole, cefpiramide, cefpirome, cefprozil, cefroxadine, cefsulodin, ceftazidime, cefteram, ceftezole, ceftibuten, ceftiofur, ceftizoxime, ceftriaxone, cefuroxime, cefuzonam, cephacetrile sodium, cephalexin, cephaloglycin, cephaloridine, cephalosporin C, cephalothin, cephapirin sodium, cephradine, chloramphenicol, chlortetracycline, cinoxacin, clavulanic acid, clometocillin, cloxacillin, cyclacillin, cycloserine, demeclocycline, dicloxacillin, epicillin, fenbe- cillin, flomoxef, floxacillin, hetacillie, imipenem, lenampi- cillin, loracarbef, lymecycline, mafenide, meclocycline, mero- penem, metampicillin, methacycline, methicillin sodium, mezlo- cillin, minocycline, moxalactam, mupirocin, myxin, negamycin, novobiocin, oxacillin, panipenem, penicillin G potassium salt, penicillin N, penicillin O, penicillin V, phenethicillin potassium salt, pipacycline, piperacillin, pirlimycin, porfi- romycine, propycillin, quinacillin, ritipenem, rolitetracycli- ne, sancycline, sedecamycin, spectinomycin, sulbactam, sulbe- nicillin, temocillin, tetracycline, ticarcillin, tigemonam, tubercidin, azithromycin, clarithromycin, dirithromycin, enviomycin, erythromycin, josamycin, midecamycin, miokamycin, oleandomycin, rifabutin, rifamide, rifamycin, rifaximin, rokitamycin, spiramycin, troleandromycin, viomycin, virginiamycin ; amikacin, apramycin, arbekacin, dibekacin, dihydrostreptomycin, fortimicins, gentamicin, micronomicin, neomycin, netilmicin, paromomycin, ribostamycin, sisomicin, spectinomycin, streptomicin, tobramycin, trospectomycin; bacampicillin, cefcapene pivoxil, cefpodoxime proxetil, panipenem, pivampicillin, pivcefalexin, sultamicillin, talampicillin; carbomycin, clindamycin, lincomycin, mikamycin, rosaramicin, ciprofloxacin, clinafloxacin, difloxacin, enoxacin, enrofloxacin, fleroxacin, flumequine, grepafloxacin, lomefloxacin, nadifloxacin, nalidixic acid, norfloxacin, ofloxacin, pazufloxacin, pefloxacin, pipemidic acid, piromidic acid, rufloxacin, sparfloxacin, tosufloxacin, trovafloxacin, clomocycline, guamecycline, oxytetracycline, nifurpirinol, nifurprazine; p-aminosalicylic acid, p-aminosalicylic acid hydrazide, clofazimine, deoxydihydrostreptomycin, ethambutol, glyconiazide, isoniazid, opiniazide, phenyl aminosalicylate, rifampin, rifapentine, salinazid, 4-4'-sulfynyldianiline, Acediasulfone, dapsone, succisulfone, p-sulfanilylbenzylamine, thiazolsulfone, acetyl sulfamethoxypyrazine, mafenide, 4'- (methylsulfamoyl) sulfanilanilide, salazosulfadimidine, sulfabenzamide, sulfacetamide, sulfachlorpyridazine, sulfachrysoidine, sulfacytine, sulfadiazine, sulfadicramide, sulfadimethoxine, sulfadoxine, sulfaethidole, sulfaguanidine, sulfaguanole, sulfalene, sulfamerazine, sulfameter, sulfamethazine, sulfamethizole, sulfamethomidine, sulfamethoxazole, sulfamethoxypyridazine, sulfamethylthiazole, sulfametrole, sulfamidochrysoidine, sulfamoxole, sulfanilamide, 2-p-sulfanilylanilinoethanol, N4-sulfanilylsulfanilamide, sulfanilylurea, N-sulfanilyl-3,4-xylamide, sulfaperine, sulfaphenazole, sulfaproxyline, sulfapyrazine, sulfapyridine, sulfasomizole, sulfasymazine, sulfathiazole, sulfathiourea, sulfisomidine, sulfisoxazole, 4-sulfanilamido salicylic acid; negamycin, carumonan, cloxyquin, nitroxoline, arginine, metronidazole; antiviral drugs: acyclovir, amantadine, cidofovir, cytarabine, didanosine, dideoxyadenosine, edoxudine, famciclovir, floxuridine, ganciclovir, idoxuridine, indanavir, kethoxal, lamivudine, MADU, penciclovir, podophyllotoxin, ribavirin, rimantadine, saquinavir, sorivudine, stavudine, trifluridine, valacyclovir, vidarabine, xenazoic acid, zalcitabine, zidovudine; among bone resorption inhibitors (diphosphomates) the following can be mentioned: alendronic acid, butedronic acid, etidronic acid, oxidronic acid, pamidronic acid, risedronic acid; among antidementia drugs the following can be mentioned: amiridine, lazabemide, mofegiline, salbeluzol, oxiracetam, ipidacrine, nebracetam, tacrine, velnacrine.

The preferred substances are the following: among anti-inflammatories: acetylsalicylic acid, 5- aminoacetylsalicylic acid, carprofen, diclofenac sodium, diflu- nisal, etodolac, flufenamic acid, flunixin, flurbiprofen, ibuprofen, indomethacin, indoprofen, ketoprofen, ketorolac, lornoxicam, loxoprofen, meclofenamic acid, mefenamic acid, meloxicam, mesalamine, naproxen, niflumic acid, olsalazine, piroxicam, salsalate, sulindac, suprofen, tenoxicam, tiaprofenic acid, tolfenamic acid, tolmetin, zomepirac, tomoxi- prol; among analgesic drugs: acetaminophen, acetylsalicylsalicylic acid, benoxaprofen, buprenorphine, butorphanol, capsaicin, diacereine, dihydrocodeine, ethylmorphine, eugenol, phenylbuta- zone, meptazinol, morphine, nalbuphine, pentazocine, thiorphan, tramadol, actarit; among respiratory and urogenital apparatus drugs: (bronchodila- tors, drugs active on the cholinergic system, expectorants/mucolytics, antiasthmatics/antiallergic antihista- minic drugs): bronchodilators and drugs active on the cholinergic system : albuterol, carbuterol, clenbuterol, difylline, etofylline, fenoterol, ipratropium bromide, metaproterenol, oxybutynin, pirbuterol, salmeterol, terbutaline, tiotropium bromide, zaprinast, cyclodrine, NS-21,2-hydroxy-2,2-diphenyl-N- (1,2,3,6-tetrahydro-pyridin-4-ylmethyl) acetamide; expectorant/mucolytic drugs: ambroxol, bromexine, guaia- col, sobrerol; antiasthmatic/antiallergic antihistaminic drugs: cetirizine, chromoglycate, histamine, levocabastine, lodoxamide, montelukast, terfenadine, bromexine.

Among cardiovascular drugs: ACE-inhibitors: captopril, enalapril, lisinopril, losar- tan, ramipril; beta blockers: alprenolol, atenolol, bupranolol, labe- talol, metipranolol, metoprolol, pindolol, propranolol, timo- lol; antithrombotic and vasoactive drugs: acetylsalicylic acid, acetorphan, argatroban, clopidogrel, dalteparin, dipyri- damole, enoxaparin, heparin, iloprost, midodrine, ozagrel, phenylpropanolamine trifusal; antidiabetic drugs: tolrestat, nicotinamide; among antitumoral drugs: anthramycin, daunorubicin, doxo- rubicin, epirubicin, fluorouracil, methotrexate, vinblastine; among antiulcer drugs: cimetidine, omeprazole, pantoprazo- le; among antihyperlipidemic drugs: lovastatin, pravastatin sodium, simvastatin; among antibiotic/antiviral drugs: antibiotic drugs: amoxicillin, ampicillin, aztreonam, biapenem, carbenecillin, cefaclor, cefadroxil, cefamandole, cefatrizine, cefoxitin, clavulanic acid, dicloxacillin, imi- penem, meclocycline, methacycline, moxalactam, panipenem, sul- bactam, azithromycin, erythromycin, josamycin, miokamycin, ri- fabutine, rifamide, rifamycin, gentamicin, paromomycin, sisomicin, bacampicillin, carbomycin, clindamycin, ciprofloxacin, clinafloxacin, difloxacin, enrofloxacin, lomefloxacin, nadifloxacin, norfloxacin, ofloxacin, pipemidic acid, apicycline, clomocycline, oxytetracycline, nifurpirinol, nifurprazine, isoniazid, rifampin, rifapentine, dapsone, thiazolsulfone, sulfamethoxazole, sulfamoxole, metronidazole, arginine; antiviral drugs: acyclovir, famciclovir, ganciclovir, penciclovir, ribavirin, vidarabine, zidovudine; among bone resorption inhibitors: alendronic acid, etidro- nic acid, pamidronic acid; among antidementia drugs: oxiracetam, tacrine, velnacrine.

The above mentioned substances, R precursors, are prepared according to the methods known in the prior art. See for example in"The Merck Index, 12a Ed. (1996), herein in- corporated by reference. When available, the corresponding isomers, comprising optical isomers, can be used.

Tomoxiprol is obtained according to the method describeid in EP 12,866.

The steroidal compounds wherein A = R-, have the following structure: wherein in substitution of the hydrogens of the CH groups or of the two hydrogens of the CH2 groups mentioned in the general formula, the following substituents can be present: in position 1-2: there may be a double bond; in position 2-3: there may be the following substituent: in position 2: there may be C1, Br; in position 3: there may be CO,-O-CH2-CH2-C1, OH; in position 3-4: there may be a double bond; in position 4-5: there may be a double bond; in position 5-6: there may be a double bond; in position 5-10: there may be a double bond; in position 6: there may be Cl, F, CH3,-CHO; in position 7: there may be C1, OH; in position 9: thre may be C1, F; in position 11: there may be OH, CO, Cl, CH3; in position 16: there may be CH3, OH, =CH2: in position 17: there may be OH, CH3, OCO (O) ua (CH2) vaCH3, C=CHor wherein ua is an integer equal to 0 or 1, va is an integer from 0 to 4; in position 16-17: there may be the following groups: R and R', equal to or different from each other, can be hydrogen or linear or branched alkyls from 1 to 4 carbon atoms, preferably R = R'= CH3; R"is- (CO-L) (L)- (X) ti- wherein t, tl and t2 are integers equal to or different from each other equal to 0 or 1, with the proviso that when t = 0 t2 = 1 and when t = 1 t2 = 0, and that t and tl, or t2 and tl, cannot contemporaneously be equal to 0 when A does not contain-OH groups; the bivalent bridging group L is selected from: (CR4R5) na (O) nb (CR4R5) n'a (CO) n'b (O) n''b (CO)n'''b(CR4R5)n''a wherein na, n'a, and n''a, equal to or different from each other, are integers from 0 to 6, preferably 1-3; nb, n'b, n''b and n'''b, equal to or different from each other, are integers equal to 0 or 1; R4, R5, equal to or different from each other, are selected from H, linear or branched alkyl from 1 to 5 carbon atoms, preferably from 1 to 3; XoI is X as above defined, or equal to X2I wherein X2I is equal to OH, CH3, C1, N (-CH2-CH3) 2 SCH2F SH, or Preferably R"=-CO-CH2OH,-CH (CH3)-CH2-CH2-COOH.

In the precursor steroids those having the hydroxyl function in position 3 and/or in position 11, and/or having in R"an hydroxyl or carboxylic function in terminal position, are preferred.

The precursor steroids of A which can be mentioned and which are preferred, are those listed hereinunder, obtainable according to the processes known in the art.

As precursors and respective processes, those for example described in The Merck Index, ed. 12 of 1996, herein incorporated by reference, can be mentioned. The precursors (according to the Merck nomenclature) are the following, wherein H2, H, R, R', R''have the meaning mentioned in the compounds listed herein: Budesonide, Hydrocortisone, Alclome- thasone, Algestone, Beclomethasone, Betamethasone, Chloro- prednisone, Clobetasol, Clobetasone, Clocortolone, Cloprednol, Cortisone, Corticosterone, Deflazacort, Desonide, Desoxi- methasone, Dexamethasone, Diflorasone Diflucortolone, Diflu- prednate, Fluazacort, Flucloronide, Flumethasone, Flunisolide, Fluocinolone Acetonide, Fluocinonide, Fluocortyn Butyl, Fluocortolone, Fluorometholone, Fluperolone Acetate, Flu- prednidene Acetate, Fluprednisolone, Flurandrenolide, Formo- cortal, Halcinonide, Halobetasol Propionate, Halomethasone, Halopredone Acetate, Hydrocortamate, Loteprednol Etabonate, Medrysone, Meprednisone, Methylprednisolone, Momethasone Furoa- te, Paramethasone, Prednicarbate, Prednisolone, Prednisolone 25-Diethylaminoacetate, Prednisolone Sodium Phosphate, Predni- sone, Prednival, Prednylidene, Rimexolone, Triamcinolone, Tri- amcinolone Acetonide, 21-Acetoxypregnenolone, Cortivazol, Am- cinonide, Fluticasone Propionate, Mazipredone, Tixocortol, Triamcinolone Hexacetonide, Ursodesoxycholic acid, Chenodeoxycholic acid, Mitatrienediol, Moxestrol, Ethynylestra- diol, Estradiol, Mestranol.

The formula (I) compounds are prepared as mentioned hereinafter.

If the reactive function of the drug (for example-COOH,- OH) is involved in a covalent bond, for example of ester, amide, ether type, said function can be restored with the methods well known in the prior art.

The reactions used for obtaining the formula (I) compounds are reactions leading to the formation of bonds for example of ester, amide, thioester type well known to the skilled in the field.

If in the two compounds of the reaction other functional groups COOH and/or HX wherein X is as above defined are present, they must be protected before the reaction according to the methods known in the prior art; for example as described in the paper by Th. W. Greene:"Protective groups in organic synthesis", Harward University Press, 1980.

When in the radical B there is a second reactive function, of XZ and ZI-N-ZII type wherein X, Z, ZI and ZII are as above I defined, or a COOH, =NH function, it is possible to bind to B a radical corresponding to the formula (III), wherein the free valence is saturated with a reactive function such as to be combined with the second reactive function of B. Also in this case the reactions are those commonly used in the prior art.

The obtained compound is reacted with the drug precursor.

The compounds object of the present invention are formulated in the corresponding pharmaceutical compositions for parenteral, oral and topic use according to the well known methods of the prior art, along with the usual excipients; see for example the paper"Remington's Pharmaceutical Sciences 15a Ed.".

The amount on a molar basis of the active principle in these formulations is the same, or lower, compared with that used of the corresponding precursor drug.

The daily administrable doses are those of the precursor drugs, or in case lower. The daily doses can be found in the publications of the field, such as for example in"Physician's Desk reference".

The following examples have the purpose to illustrate the invention and are not to be considered as limitative of the same.

EXAMPLE 1 Synthesis of (S, S)-N-acetyl-S- (6-methoxy-a-methyl-2-naphthalen acetyl) cysteine having the formula The precursor is naproxene (Formula VI), the precursor of B is N-acetylcysteine of formula (CVIII) a)Synthesisof (S, S)-N-acetyl-S- (6-methoxy-a-methyl-2-naphtha- len acetyl) cysteine To a solution of 6-methoxy-a-methyl-2-naphthalenacetic acid (10 g, 43.4 mmoles) in chloroform (100 ml) and N, N-dime- thylformamide (6 ml), 1,1'-carbonyldiimidazole (7.04 g, 43.4 mmoles) is added. After 15 minutes the obtained solution is treated with (S)-N-acetylcysteine (7.08 g, 43.4 mmoles) and left at room temperature for 12 hours. The reaction mixture is washed with HC1 5%, then with water and lastly with brine. The organic phase is anhydrified with sodium sulphate and then evaporated at reduced pressure. The obtained residue is purified by chromatography on silica gel eluting with ethyl acetate. 11.66 g of the expected product are obtained in the form of a white solid having m. p. 122°-126°C.

1H-NMR (CDC13): 7.71-7.65 (3H, m), 7.34 (1H, dd), 7.16-7.09 (2H, m), 6.36 (1H, d), 4.67 (1H, m), 4.00 (1H, q), 3.90 (3H, s) 3.32 (2H, t), 1.84 (3H, s), 1.59 (3H, d).

EXAMPLE 2 Synthesis of (S)-N-acetyl-S-{a-methyl [4-(2-methylpropyl) ben- zene] acetyl} cysteine having formula The precursor is ibuprofen of formula VII, the precursor of B is N-acetylcysteine of formula (CVIII) a) Synthesis of (S)-N-acetyl-S- (a-methyl [4- (2-methylpropyl) benzene] acetyl} cysteine To a solution of a-methyl [4- (2-methylpropyl) benzene] ace- tic acid (10 g, 48.48 mmoles) in chloroform (100 ml) and N, N- dimethylformamide (6 ml) 1, 1'-carbonyldiimidazol (7.86 g, 48.48 mmoles) is added. After 1 hour the obtained solution is treated with (S)-N-acetylcysteine (7.91 g, 48.47 mmoles) and left at room temperature for 24 hours. The reaction mixture is washed with HC1 5%, then with water and lastly with brine. The organic phase is anhydrified with sodium sulphate and then evaporated at reduced pressure. The obtained residue is purified by chromatography on silica gel eluting with ethyl acetate. 13.3 g of the expected product are obtained in an oil form.

H-NMR (CDC13): 10.17 (1H, s) 7.13 (2H, d) 6.54 (1H, d), 4.76 (1H, m), 3.93 (1H, q), 3.42-3.30 (2H, m), 2.49 (2H, d), 1.85-1.83 (4H, m), 1.55 (3H, d), 0.93 (6H, d).

EXAMPLE 3 Synthesis of (S)-N-acetyl-S- [l- (4-chlorobenzoyl)-5-methoxy-2- methyl-lH-indol-3-acetyl] cysteine having formula The precursor is indomethacin of formula (VIII), the pre- cursor of B is N-acetylcysteine of formula (CVIII) a) Synthesis of (S)-N-acetyl-S- [1- (4-chlorobenzoyl)-5-methoxy- 2-methyl-lH-indol-3-acetyl] cysteine To a solution of 1- (4-chlorobenzoyl)-5-methoxy-2-methyl- lH-indol-3-acetic acid (10 g, 28.00 mmoles) in chloroform (100 ml) and N, N-dimethylformamide (2 ml) 1,1'-carbonyldiimidazol (4.53 g, 28.00 mmoles) is added. After 1 hour the obtained solution is treated with (S)-N-acetylcysteine (4.56 g, 28.00 mmoles) and left at room temperature for 24 hours. The reaction mixture is washed with HC1 5%, then with water and lastly with brine. The organic phase is anhydrified with sodium sulphate and then evaporated at reduced pressure. The obtained residue is purged by chromatography on silica gel eluting with ethyl acetate. 7.79 g of the expected product are obtained in the form of a yellow solid having m. p. 129°C.

1H-NMR (DMSO-d6): 12.90 (1H, s), 8.21 (1H, d), 7.69-7.64 (4H, m), 7.06 (1H, d), 6.96 (1H, d), 6.73 (1H, dd), 4.33 (1H, m), 4.02 (2H, s), 3.77 (3H, s), 3.33-2.96 (2H, m), 2.22 (3H, s), 1.78 (3H, s).

EXAMPLE 4 Synthesis of (S)-N-acetyl- [2-fluoro-a-methyl- (1, 1'-biphenyl)-4- acetyl] cysteine having formula The precursor is flurbiprofen of formula (IX), the precur- sor of B is N-acetylcysteine of formula (CVIII) The compound is synthetized according to the process described in Example 1. The compound looks as an oil. Yield: 70% 1H-NMR (CDCl3): 8.38 (1H, d), 7.67-7.50 (6H, m), 7.49- 7.53 (2H, m), 4.52-4.41 (1H, m), 4.22 (1H, q), 3.50-3.10 (2H, m), 1.92 (3H, s), 1.58 (3H, d).

EXAMPLE 5 Preparation of trans-3- [4- [a-methyl- [4- (-2-methylpropyl) benze- ne] acetyloxy]-3-methoxyphenyl]-2-propenoic acid having formula: The precursor is ibuprofen of formula (VII), the precursor of B is ferulic acid of formula (DII): a) Synthesis of the trans-3- [4- [a-methyl- [4- (-2-methylpropyl) benzene] acetyloxy]-3-methoxyphenyl]-2-propenoic acid To a solution of a-methyl- [4- (2-methylpropyl) benzene] ace- tic acid (5.03 g, 24.4 mmoles) in tetrahydrofuran (100 ml) and N, N-dimethylformamide (5 ml) 1,1-carbonyldiimidazole (4.25 g, 24.8 mmoles) is added. After 1 hour the obtained solution is treated with ferulic acid (4.90 g, 25 mmoles), sodium ethylate (89 mg) is added and then it is left at room temperature under stirring for 12 hours. The reaction mixture is washed with HC1 5%, then with water and lastly with brine. The organic phase is anhydrified with sodium sulphate and evaporated at reduced pressure.

The obtained residue is purified by chromatography on silica gel, eluting with ethyl acetate/n-hexane 7/3.5.1 g of trans-3- [4- [a-methyl- [4- (-2-methylpropyl) benzene] acetyl]-3- methoxyphenyl]-2-propenoic acid are obtained as a white solid, having m. p. 131°-137°C.

1H-NMR (CDC13): 7.72 (1H, d), 7.32 (2H, dd), 7.26 (1H, m), 7.16-7.07 (4H, m), 6.98 (1H, d), 6.37 (1H, d), 3.99 (1H, q), 3.73 (3H, s), 2.47 (2H, d), 1.88 (1H, m), 1.63 (3H, d), 0.92 (6H, d).

EXAMPLE 6 Synthesis of trans-3- [4- [2-fluoro-a-methyl- (1, 1'-biphenyl)-4- acetyloxy]-3-methoxyphenyl]-2-propenoic acid having formula: The precursor is flurbiprofen of formula (IX), the precur- sor of B is ferulic acid of formula (DII) The compound is synthetized according to the process described in Example 5. The total process yield is 60%. The compound looks as an amorphous solid.

1H-NMR (CDC13): 7.75 (1H, d), 7.52 (2H, m), 7.46-7.26 (4H, m) 7.26 (3H, m), 7.05 (2H, m), 7.00 (1H, d), 6.37 (1H, d), 4.03 (1H, q), 3.77 (3H, s), 1.65 (3H, d).

EXAMPLE 7 Preparationof N-acetyl-S-[(S)-a-(2-chlorophenyl)-6,[(S)-a-(2-chlorophenyl) -6, 7-dihydro- thieno [3,2-c] pyridin-5 (4H) acetyl] (S)-cysteine wherein the precursor is clopidogrel having formula (XI) and the precursor of B is N-aceticysteine having formula (CVIII): The compound is synthetized following the procedure re- ported in Example 1. The yield is 51%.

Elementary analysis: Calculated C: 53.03% H: 4.67% N: 6.18% S: 14.16% Cl: 17.82% Found C: 53.00% H: 4.63% N: 6.15% S: 14.10% Cl: 17.87% EXAMPLE 8 Preparation of [3-methoxy-4-hydroxyphenyl]-2-trans-propenoyl- 4- [(2-amino-3,5-dibromophenyl) methylamino] cyclohexanol wherein the precursor is ambroxol having formula (XII) and the precursor of B is represented by ferulic acid having for- mula (DII): a) Synthesis of 4- [ (2-tert-butoxycarbonylamino-3, 5-dibromophe- nyl) methylamino] trans cyclohexanol To a mixture of 4- [ (2-amino-3,5-dibromophenyl) methyl- amino] cyclohexanol (5 g, 13.22 mmoles) in dioxane (35 ml) and water (50 ml), triethylamine (3.31 ml, 23.7 mmoles) and di- tert-butyldicarbonate (3.46 g, 15.86 mmoles) are added under stirring. After 24 hours the solution is concentrated under vacuum, a HC1 1% solution until neutral pH (pH=7) is added and the organic phase is extracted with ethyl acetate. The organic phase is anhydrified with sodium sulphate and evaporated under vacuum. 4- [ (2-tert-butoxycarbonylamino-3,5-dibromophenyl) methyl amino] cyclohexanol is obtained which is used without further purification. b) Synthesis of (3-methoxy-4-hydroxyphenyl)-2-trans-propenoyl- 4- [ (2-tert-butoxycarbonylamino-3,5-dibromophenyl) methylamino] cyclohexanol ester To a solution of ferulic acid (4 g, 20.5 mmoles) in te- trahydrofuran (40 ml) cooled at 0°C, 1,1'-carbonyldiimidazole (3.34 g, 20.5 mmoles) is added. After 10 minutes the solution is treated with 4- [ (2-ter-butoxycarbonylamino-3,5- dibromophenyl) methyl amino] cyclohexanol (9.8 g, 20.5 mmoles) and let react at room temperature for 4 hours. The reaction mixture is concentrated under vacuum, treated with methylene chloride, washed with a HC1 1% solution and then with water.

The organic phase is anhydrified with sodium sulphate and then evaporated under vacuum. The obtained residue is purified by chromatography on silica gel, eluting with n-hexane/ethyl acetate 1/1. (3-methoxy-4-hydroxyphenyl)-2-trans propenoyl 4- [ (2-tert-butoxycarbonylamino-3,5-dibromo phenyl) methylamino] cyclohexanol ester, is obtained. c) Synthesis of [3-methoxy-4-hydroxy) phenyl]-2-trans propenoyl- 4-[(2-amino-3,5-dibromo-phenyl) methylamino] cyclohexanol ester To a solution of (3-methoxy-4-hydroxyphenyl)-2-trans pro- <BR> <BR> <BR> <BR> penoyl-4- [ (2-ter-butoxycarbonylamino-3,5-dibromo-phenyl)- methylamino] cyclohexanol ester (2 g, 3.06 mmoles) in ethyl acetate (50 ml), cooled at 0°C and kept under stirring, a 5N HC1 solution in ethyl acetate (3.17 ml) is added. Lastly the precipitate is filtered. The obtained crude product is treated with ethyl acetate, to which a 5% sodium bicarbonate solution is added. The mixture is shaken and the bicarbonate solution is replaced with an equal part of water. The mixture is shaken again, the organic phase is recovered, anhydrified with sodium sulphate and evaporated at reduced pressure. [3-methoxy-4- hydroxyphenyl]-2-transpropenoyl 4- [ (2-amino-3,5-dibromo phenyl) methylamino] cyclohexanol ester is obtained. Yield: 41%.

Elementary analysis: Calculated C: 50.90% H: 4.62% N: 4.94% Br: 28.22% Found C: 50.81% H: 4.63% N: 4.89% Br: 28.18% EXAMPLE 9 Preparation of S- [ [2- [4- (4-chlorophenyl) phenylmethyl)-1-pipera- zinyl] ethoxy] acetyl] penicillamine having formula wherein the precursor is cetirizine of formula (XIV) and the precursor of B is penicillamine (formula CV): a)Synthesis of S- [ [2- [4- [ (4-chlorophenyl) phenylmethyl]-1-pipe- razinyl] ethoxy] acetyl] N-tert-butoxycarbonylpenicillamine The compound is prepared according to the method reported in Example 1, using N-tert-butoxycarbonyl-penicillamine instead of N-acetyl cysteine. b)S-[[2-[4-[4-chlorophenyl)phenylmethyl]-1-pipe-of razinyl] ethoxy] acetyl]-penicillamine The compound is obtained from the previous one by follow- ing the method described in step c) of Example 8 in order to remove the protective group N-tert-butoxycarbonyl and recover the aminic function. Yield: 29%.

Elementary analysis: Calculated C: 58.96% H: 6.59% N: 7.63% S: 5.83% Cl: 16.44% Found C: 58.89% H: 6.50% N: 7.58% S: 5.79% Cl: 16.40% EXAMPLE 10 Preparation of N-acetyl-S- [ (S)-l- [N- [l- (ethoxycarbonyl)-3- phenylpropyl]-L-alanyl]-L-prolin] cysteine wherein the precursor is enalapril of formula (XV) and the pre- cursor of B is N-acetylcysteine (formula CVIII): The compound is synthetized following the method reported in Example 1. Yield: 35% Elementary analysis: Calculated C: 58.30% H: 6.96% N: 7.84% S: 5.98% Found C: 58.25% H: 6.94% N: 7.88% S: 5.87% EXAMPLE 11 Preparation of N-nicotinoyl-ß-alanyl (L)-histidine wherein the precursor is nicotinamide of formula (XXIII) and the precursor of B is carnosine (formula CI): a) Synthesis of N-nicotinoyl-ß-alanyl (L)-histidine To a solution of nicotinic acid (2.5 g, 20.5 mmoles) in tetrahydrofuran (40 ml) cooled at 0°C, 1,1'-carbonyldiimidazol (3.34 g, 20.5 mmoles) is added under stirring. After 10 minutes to the solution (L)-carnosine (4.6 g, 20.5 mmoles) is added and it is left under stirring at room temperature for 4 hours. The reaction mixture is concentrated under vacuum, treated with methylene chloride, washed with HC1 1% and then with water. The organic phase is anhydrified with sodium sulphate and evaporated under vacuum. The obtained residue is chromatographed on silica gel column, eluting with ethyl ace- tate. N-nicotinoyl-ß-alanyl (L)-histidine is recovered. Yield 45%.

Elementaryanalysis: Calculated C: 54.49% H: 4.88% N: 21.27% Found C: 54.30% H: 5.00% N: 21.30% EXAMPLE 12 Preparation of 7- [2-hydroxy-3- [3-methoxy-5-hydroxybenzoyl] trans-2-propenoyl] theophylline wherein the precursor is the diphylline of formula (XXVI) and the precursor of B is the ferulic acid (formula DII): The drug is synthetized according to the process described in Example 8. Yield: 28% Elementary analysis: Calculated C: 57.66% H: 5.32% N: 10.13% Found C: 57.70% H: 5.37% N: 10.11% EXAMPLE 13 Preparation of N-acetyl-S- (2-acetylbenzoyl) cysteine of formula wherein the precursor is acetylsalicylic acid of formula (XXVII) and the precursor of B is N-acetylcysteine (formula CVIII): The compound is synthetized according to the process de- scribed in Example 1. Yield 63%.

Elementary analaysis Calculated C: 51.69% H: 4.65% N: 4.31% S: 9.86% Found C: 51.64% H: 4.68% N: 4.33% S: 9.89% EXAMPLE 14 Preparation of 4- [3- [3-methoxy-5-hydroxyphenyl]-2- <BR> <BR> <BR> propenoyloxy]-2-methyl-N-2-pyridinyl-2H-1,2-benzothiazin-3- carboxamide-1,1-dioxide wherein the precursor is piroxicam of formula (XXVIII) and the precursor of B is ferulic acid (formula DII): The compound is synthetized according to the process reported in Example 8. Yield 25%.

Elementary analysis Calculated C: 59.14% H: 4.17% N: 8.31% S: 6.31% Found C: 59.01% H: 4.09% N: 8.20% S: 6.21% EXAMPLE 15 Preparation of S- [2- [ (2,6-dichlorophenyl) amino) benzeneacety- loxy] penicillamine of formula wherein the precursor is diclofenac of formula (XXIX) and the The compound is synthetized according to the process described in Example 9. Yield 53%.

Elementary analysis Calculated C: 49.88% H: 3.66% N: 7.30% S: 8.32% Cl: 18.40% Found C: 49.90% H: 3.64% N: 7.29% S: 8.25% Cl: 18.35% EXAMPLE 16 Synthesis of the 3- [2-f luoro-a-methyl- (1, 1'-biphenyl)-4-ace- tyl] thiazolidin-4-carboxylic acid starting from flurbiprofen of formula (IX), the precursor of B is (L)-4-thiazolidin carboxylic acid of formula (PIV) a) Synthesis of the 3- [2-f luoro-a-methyl- (1, 1 1-biphenyl)-4-ace- tyl] thiazolidin-4-carboxylic acid To a solution of 2-fluoro-a-methyl- (1, 1'-biphenyl)-4-ace- tic acid (10 g, 41 mmoles) in toluene (100 ml) and N, N- dimethylformamide (10 ml) cooled at 0°C, oxalylchloride (3. 52 ml, 82 mmoles) is added. After 2 hours at room temperature, the solution is evaporated at reduced pressure. The obtained residue is dissolved in acetone (50 ml) and the solution is added to a solution of 4-thiazolidincarboxylic acid (5.44 g, 41 mmoles) and triethylamine (14.9 ml, 106 mmoles) in acetone (50 ml) cooled at 0°C. After 2 hours yhe mixture is acidified with HC1 4 N, concentrated under vacuum, the residue is treated with ethyl acetate and the organic phase is washed first with HC1 2 N, then with water. The organic phase is anhydrified with sodium sulphate and evaporated at reduced pressure. By crystallization with ethyl acetate/n-hexane, 9.4 ml of the expected product are obtained in the form of a white solid having m. p. 142°-147°C.

1H-NMR (CDC13): 7.74-7.62 (4H, m), 7.35 (2H, t), 7.18-7. 13 (2H, m), 5.06 (1H, m), 4.63 (1H, d), 4.42 (1H, d), 4.14 (1H, q), 3.13 (2H, m), 1.53 (3H, d).

EXAMPLE 17 Synthesis of 3- (6-methoxy-a-metil-2-naphthalenacetyl) thia- starting from naproxene of formula (VI). The precursor of B is (L)-4-thiazolidin carboxylic acid (formula PIV) a) Synthesis of 3- (6-methoxy-a-methyl-2-naphthalenacetyl) thiazolidin-4-carboxylic acid To a solution of 6-methoxy-a-methyl-2-naphthalenacetic acid (4.02 g, 17.5 mmoles) in toluene (30 ml) and N, N-dimethyl- formamide (0.3 ml) cooled at 0°C, oxalylchloride (2.92 ml, 34.06 mmoles) is added. After 2 hours at room temperature, the solution is evaporated at reduced pressure. The obtained residue is dissolved in acetone (50 ml) and the solution is added to a solution of 4-thiazolidincarboxylic acid (2.33 g, 17.5 mmoles) and triethylamine (6.34 ml, 45.5 mmoles) in acetone (50 ml) cooled at 0°C. After 2 hours the mixture is acidifie with HC1 4 N, concentrated under vacuum, the residue is treated with ethyl acetate and the organic phase is washed first with HC1 2 N, then with water. The organic phase is anhydrified with sodium sulphate and evaporated under reduced pressure. 4.43 g of the expected product are obtained in the form of a white solid having m. p. 165°-168°C.

1H-NMR" (CDC13): 7.75-7.66 (3H, m), 7.34 (1H, d), 7.14-7.11 (2H, m), 5.14 (1H, m), 4.80-4.61 (2H, m), 4.07 (1H, q), 3.91 (3H, s), 3.30-3.23 (2H, m), 1.53 (3H, d).

EXAMPLE18 <BR> <BR> <BR> Synthesis of the 3- (6-methoxy-a-methyl-2-naphthalenacetyl)- (R)- 2-oxothiazolidin-4-carboxylic acid starting from naproxene of formula (VI). The precursor of B is (L)-2-oxo-4-thiazolidin carboxylic acid (formula PV) a) synthesis of the 3- (6-methoxy-a-methyl-2-naphthalenacetyl)- (R)-2-oxothiazolidin-4-carboxylic acid To a solution of 6-methoxy-a-methyl-2-naphthalenacetic acid (7.0 g, 30.4 mmoles) in toluene (100 ml) and N, N-dimethyl- formamide (10 ml) cooled at 0°C, oxalylchloride (5.23 ml, 61 mmoles) is added. After 2 hours at room temperature the solution is evaporated under reduced pressure. To the solution of the obtained residue dissolved in tetrahydrofuran (50 ml) a mixture formed of 2-oxothiazolidin-4-carboxylic acid (4.07 g.

79 27.6 mmoles), 4-dimethylaminopyridine (0.84 g, 6.9 mmoles), triethylamine (7.69 ml, 55.2 mmoles) in tetrahydrofuran (50 ml) cooled at-10°C is added. It is left at room temperature for 24 hours. The reaction mixture is washed with HC1 5%, then with water. The organic phase is anhydrified with sodium sulphate and then evaporated at reduced pressure. The obtained residue is purified by chromatography on silica gel eluting with methylene chloride/methanol 95/5.6.79 g of the expected product are obtained in the form of an amorphous solid.

Elementary analysis Calculated C: 60.16% H: 4.76% N: 3.89% S: 8.92% Found C: 60.22% H: 4.80% N: 3.83% S: 8.91% EXAMPLE 19 Synthesis of [2-[(2, 6-dichlorophenyl) amino] benzeneacetyloxy] - (L)-histidine wherein the precursor drug of the invention compound is diclofenac of formula (XXIX) and the precursor compound of B is (L)-histidine of formula (PII): a) synthesisof [2-[(2,6-dichlorophenyl) amino] benzeneacetiloxy] (L)-histidine To a solution of diclofenac (3 g, 10.13 mmoles) in te- trahydrofuran (50 ml) cooled at 0°C, 1,1'-carbonyldiimidazole (1.69 g, 10.13 mmoles) is added under stirring. After 10 minutes the solution is treated with (L) histidine (1.57 g, 10.13 mmoles) and it is left under stirring at room temperature for 4 hours. The reaction mixture is concentrated under vacuum, treated with methylene chloride and then washed in sequence with HC1 1% and with water. The organic phase is anhydrified with sodium sulphate and evaporated under vacuum. The obtained residue is purified by chromatography on silica gel column, eluting with ethyl acetate. [2-[(2,6-dichlorophenyl) amino] benzeneacetyloxy] (L)-histidine is obtained. Yield: 61% Elementary analaysis Calculated C: 55.45% H: 4.18% N: 12.92% Cl: 16.36% Found C: 55.48% H: 4.23% N: 12.88% Cl: 16.25% PHARMACOLOGICAL TESTS EXAMPLE Acute Toxicity Acute toxicity has been evaluated by administering to a group of 10 rats weighing 20 g a single dose of each of the tested compounds, by cannula, by os in an aqueous suspension of carboxymethylcellulose 2% w/v.

The animals are kept under observation for 14 days. In no animal of the group toxic symptoms have appeared, even after administration of a 100 mg/Kg dose.

EXAMPLE F1 Test 1-experimental model in vivo with N-ethylmaleimide (NEM): study of the gastric tolerability of some drugs screened as precursors of the compounds of the invention.

The animals (rats, weight about 200 g) are distributed in the following groups (No. 10 animals for group): A) Control groups: 1° group: treatment: only carrier (aqueous suspension 1% w/v of carboxymethylcellulose, dose: 5 ml/Kg when the drug is administered by os, physiologic solution when by parenteral route), 2° group: treatment: carrier + NEM, B) Groups administered with each drug: group I: treatment: carrier + drug, group II: treatment: carrier + drug + NEM.

The drugs assayed in this experiment are the following (Table I): indomethacin, ambroxol, mesalamine, sodic alendro- nate, tacrine, omeprazol, misoprostol.

Indomethacin, ambroxol and alendronate are administered by os, mesalamine by intracolonic (rectal) route and tacrine, ome- prazol, misoprostol by subcutaneous route.

The maximum tolerated dose, determined by administering each substance by the above said routes to the animals not treated with NEM, is reported in Table I. With higher doses than those reported in the Table, enteropathy, diarrhoea, depression, tremor and sedation have appeared in the animals.

In this experimental model the animals are at first treated with NEM by subcutaneous injection at a dose of 25 mg/kg in physiologic solution. The drug is administered one hour later, in suspension in the carrier. Animals are sacrifi- ced after 24 hours and evaluation of the damage to the gastrointestinal mucosa is made by counting the number of rats, inside each group, with lesions to the stomach at a visual inspection. The total number of said rats is then divided by the total number of rats of the group and multiplied by 100.

The thus obtained percentages are reported in Table I. The Table shows that in the groups of rats treated with said drugs without NEM, no gastric lesions were detectable.

All the rats of group II (treated with NEM) showed gastric lesions after administration with the following drugs: indo- methacin, ambroxol, mesalamine, sodic alendronate, tacrine.

Said drugs therefore can be used in the synthesis of the products of the invention.

Omeprazol and misoprostol cannot instead be used, on the basis of the results provided in test 1, for preparing the products of the invention.

EXAMPLE F2 Test 2 (in vitro): inhibition of apoptosis (DNA fragmentation) induced in the endothelial cells by CIP in the presence of some drugs screened as precursors of the compounds of the invention.

The following precursor drugs (Table II): indomethacin, paracetamol, clopidogrel, salbutamol, ambroxol, sodic alen- dronate, diphylline, cetirizine, enalapril, nicotinamide, am- picilline, aciclovir, mesalamine, tacrine, simvastine, ome- prazol have been tested.

Human endothelial cells of the umbilical vein are prepared according to a standard method. Fresh umbilical veins are filled with a collagenase solution 0.1% by weight and incubated at 37°C for 5 minutes.

Subsequently the veins are perfused with the medium M 199 (GIBCO, Grand Island, NY) pH 7.4 with 0.1% (weight/volume) of collagenase, added with 10% of bovine fetus serum (10 mcg/ml), sodium heparin (50 mcg/ml), thimidine (2.4 mcg/ml), glutamine (230 mcg/ml), penicillin (100 UI/ml), streptomycin (100 mcg/ml) and streptomycin B (0.125 mcg/ml).

The cells are collected from the perfusate by centrifugation at 800 rpm and harvested in culture flasks T-75, pretreated with human fibronectin. Cells are then harvested in the same medium, added with bovine hypothalamic growth factor (100 ng/ml). When the cells of the primary cell culture (the cells directly removed from ex-vivo umbilical vein) form a single layer of confluent cells (about 8,000,000 cells/flask), harvesting is stopped and the layers are washed and trypsinized. The cellular suspensions are transferred into wells of a culture plate having 24 wells, half of said wells being added with the same culture medium containing the drug at a 10-4M concentration, and harvested in a thermostat at 37°C at a constant moisture (90%), C02 = 5% When the drug is not soluble in the culture medium, it is formerly dissolved in a small amount of di- methylsulphoxide. The maximum amount of dimethylsulphoxide which can be added to the culture medium is 0.5%. Only the cells coming from these first subcultures are used for the tests with cumene hydroperoxide (CIP). The cells are identifie as endothelial cells by morphological examination and by the specific immunological reaction towards factor VIII; these cultures did never show contaminations from myocytes or fibroblasts.

Before starting the test, the cellular culture medium is removed and the cellular layers are carefully washed with a standard physiologic solution buffered with phosphate 0.1 M pH 7.0, at the temperature of 37°C. The content of each well is then incubated for one hour with a CIP suspension in the culture medium at a 5 mM concentration. Evaluation of the cellular damage (apoptosis) is carried out by determining the per cent variation of the DNA fragmentation in the cultures containing the drug + CIP with respect to the controls treated with CIP only. Said % variation of DNA fragmentation is determined by evaluating the fluorescence variation by a BX60 Olympus microscope (Olympus Co., Roma) set at the wave length of 405-450 nm, of the test samples with respect to the optical density of the controls. The fluorescence of each sample was determined on 5 replicates. Statistic evaluation has been made with t Student test (p < 0.01).

Results are given in Table II and show that indomethacin, paracetamol, clopidogrel, salbutamol, sodic alendronate, diphylline,. cetirizine, enalapril, nicotinamide, ampicilline, aciclovir, tacrine, omeprazol do not significantly inhibit apoptosis; these drugs can therefore be used for preparing the products of the invention.

On the contrary ambroxol, mesalamine and simvastatine inhibit apoptosis. Therefore on the basis of the results of test 2 these compounds could not be used for preparing the pro- ducts of the invention.

EXAMPLE F3 Test 3-experimental in vivo model with NW-nitro-L-arginine- methyl ester (L-NAME): gastric tolerability (gastrointestinal damage incidence), hepatic (GPT dosage, glutamic-pyruvic transaminase) and cardiovascular (blood pressure) tolerability of some drugs screened as precursors of the compounds of the invention.

The experimental model adopted is according to J. Clin.

Investigation 90,278-281,1992.

The endothelial dysfunction is evaluated by determining the damage induced by L-NAME administration to the gastrointestinal mucosa, the hepatic damage (GPT increase), and the vascular endothelium or cardiovascular damage as blood hypertension.

The animals (rats, average weight 200 g) are divided in groups as herein below described. The group receiving L-NAME is treated for 4 weeks with said compound dissolved at the concentration of 400 mg/litre in drinking water. The following groups (No. 10 animals for group) are constituted: A) Control groups: 1° group: treatment: only carrier (aqueous suspension 1% w/v of carboxymethylcellulose, dose: 5 ml/Kg when the drug is administered by os, physiologic solution when by parenteral route), 2° group: treatment: carrier + L-NAME, B) Groups treated with the drug: 3° group: treatment: carrier + drug, 4° group: treatment: carrier + drug + L-NAME.

The drugs used in the test are paracetamol, doxorubicin, simvastatine, omeprazol and misoprostol. Each drug is administered once a day for 4 weeks.

The maximum tolerated dose of the drug being administered to the animals is determined by evaluating, in a separate dose scaling up experiment on untreated animals, the appearance in the animals of symptoms such as enteropathy, diarrhoea, depression, tremor, sedation.

At the end of the four weeks access to water is prevented and after 24 hours the animals are sacrificed.

One hour before the sacrifice blood pressure is determined and a blood pressure increase is taken as an indication of a damage being occurred to vascular endothelium.

The damage to the gastric mucosa is evaluated as pre- viously mentioned in test 1 (ex. F1). The hepatic damage is determined by evaluation after the sacrifice of the glutamic- pyruvic transaminase (GPT increase).

The drug meets test 3 and it can therefore be used for preparing the compounds of the invention, when in the group of rats treated with L-NAME + drug + carrier, an higher hepatic damage (higher GPT values) and/or higher gastric damage and/or higher cardiovascular damage (higher blood pessure) are found in comparison with the group treated with the carrier only, or the group treated with carrier + drug, or the group treated with carrier + L-NAME.

The test results are reported in Table IV. The % gastric lesions have been determined as in Test 1. The % GPT and % blood pressure values are referred to the corresponding value found in the animals of the 1st group of the control groups.

The average value of the blood pressure in this group was of 105 8 mmHg.

The results obtained show that paracetamol, doxorubicin and simvastatine cause hepatic damage and gastroenteropathy (GPT values and the gastric lesions are % higher compared both with the corresponding groups treated with the drug, in the absence of L-NAME, and with the controls treated with L-NAME).

These drugs can therefore be used for preparing the products of the invention.

Omeprazol and misoprostol should not instead be used, on the basis of this test, for preparing the products of the invention.

EXAMPLE F4 Test 4: inhibition of the radical production from DPPH of some substances used as precursors of B.

The method is based on a colorimetric test in which DPPH (2,2-diphenyl-1-picryl-hydrazyl) is used as the compound- forming radicals (M. S. Nenseter et A1., Atheroscler. Thromb.

15,1338-1344,1995).

Solutions in methanol of the tested substances at a final concentration 100 uM are initially prepared. 0.1 ml of each of these solutions are added to aliquots of 1 ml of a methanol solution 0.1 M of DPPH and then the final volume is brought to 1.5 ml. After having stored the solutions at room temperature away from light for 30 minutes, the absorbance at the wave length of 517 nm is read. It is determined the absorbance decrease with respect to the absorbance of a solution containing the same concentration of DPPH.

The efficacy of the test compound to inhibit the production of radicals, or antiradical activity, is expressed by the following formula: (1-AS/AC) X100 wherein As and Ac are, respectively, the absorbance values of the solution containing the test compound together + DPPH and of the solution containing only DPPH.

The compound to be used according to the present invention meets test 4 if radical production inhibition, as above defined, is equal to or higher than 50%.

In Table V the results obtained with the following sub- stances are reported: N-acetylcysteine, cysteine, ferulic acid, (L)-carnosine, gentisic acid, 4-thiazolidin carboxylic acid and 2-oxo-4-thiazolidincarboxylic acid.

Table V shows that: -N-acetylcysteine, cysteine, ferulic acid, (L)-carnosine, gentisic acid meet test 4 since they inhibit the production of radicals induced by DPPH to an extent higher than 50%.

-The 4-thiazolidin carboxylic acid and the 2-oxo-4- thiazolidincarboxylic acid are ineffective, since they do not inhibit radical production from DPPH. Therefore they can be used as precursors of the compound B in the synthesis of the compounds according to the present invention, if they meet test 5.

EXAMPLE F5 Test 5: inhibition of the radical production from Fe from compounds used as precursors of B 0.1 ml aliquots of 10-4 M methanolic solutions of 4- thiazolidin carboxylic acid and 2-oxo-4-thiazolidin carboxylic acid are added to test tubes containing an aqueous solution formed by mixing 0.2 ml of 2 mM deoxyribose, 0.4 ml of buffer phosphate pH 7.4 100 mM and 0.1 ml of 1 mM FeII (NH4) 2 (S04) 2 in 2mM HC1. The test tubes are then kept at a temperature of 37°C for one hour. Then in each test tube are added in the order 0.5 ml of a 2.8% solution in trichloroacetic acid in water and 0.5 ml of an aqueous solution 0.1 M thio barbituric acid. A reference blank is constituted by substituting the above 0.1 ml aliquots of the test compound methanolic solutions with 0.1 ml of methanol. The test tubes are closed and heated in an oil bath at 100°C for 15 minutes. A pink coloration develops the intensity of which is proportional to the quantity of deoxyribose undergone to radical oxidative degradation. The solutions are cooled at room temperature and their absorbances at 532 nm are read against the blank.

The inhibition induced by the precursor of B or B1 or C = -TC-Y-H (wherein the free valence is saturated as above defined) in the confront of radical production from Fe is determined as a percentage by means of the following formula: (1-AS/AC) X100 wherein As and Ac are respectively the absorbance values of the solution containing the tested compound + the iron salt and that of the solution containing only the iron salt.

The results are reported in the attached Table, which shows that both acids are active in inhibiting the radical production from the iron ion. Therefore these compounds can be used as precursors of B for obtaining the present invention compounds.

EXAMPLE F6 Gastric tolerability test of the compounds according to the invention with respect to the corresponding precursor drugs in conditions of endothelial trouble induced by L-NAME (NW-nitro- L-arginine-methyl ester).

Example F3 was repeated and it was evaluated gastric tolerability both of the following precursor drugs and of the corresponding derivatives according to the present invention: -Diclofenac and corresponding derivative according to Ex.

15, -Piroxicam and corresponding derivative according to Ex.

14.

-Aspirin and corresponding derivative according to Ex. 13.

The results are reported in Table VI and show that, by administering at the same dose the compounds of the invention and the corresponding precursor drug, gastropathy incidence results remarkably reduced or disappeared in the groups treated with the compounds of the invention.

EXAMPLE 20 Synthesis of 3 (3-methoxy-4-hydroxy-phenyl)-2-trans propenoic acid 1- [ (l-methylethyl) amino]-3- (l-naphtalenoxy)-2-propyl ester of formula (CCI) starting from propranolol of formula (XXIV). The precursor of B is ferulic acid (formula DII) Compound (CCI) has been obtained according to the process of Example 8. Yield: 30% Elemental analysis Calculated : C : 71.71 H : 6.71 N: 3.22 Found: C : 71.79 H : 6.75 N : 3.17 EXAMPLE 21 <BR> <BR> <BR> Synthesis of N-acetyl-S- [1- [5- (2,5-dihydro-5-oxo-3-furanyl)-3- methyl-2-benzofuranyl] ethyloxy-4-oxo-butanoyl]-cysteine of formula (CCII) starting from benfurodil hemisuccinate of formula (XXXI). The precursor of B is N-acetylcysteine of (formula CVIII) Compound (CCII) has been obtained according to the process of Example 1. Yield: 13% Elemental analysis Calculated : C : 57.25 H : 5.00 N : 2.78 S : 6.37 Found: C : 57.30 H : 5.02 N : 2,72 S : 6.35 EXAMPLE 22 Synthesis of 5-methoxy-2- [ [ [ (3-methoxy-4-hydroxy-phenyl)-2- trans propenoyl oxy]-3,5-dimethyl-2-pyridinyl] methyl] sulphinyl- ]-lH-benzimidazole of formula (CCIII) starting from 4-hydroxyomeprazole of formula (XXII) and ferulic acid (formula DII) Compound (CCIII) has been obtained according to the process of Example 8. Yield: 43% Elemental analysis Calculated : C : 61.65 H : 4.78 N : 8.30 S : 6.33 Found: C : 61.71 H : 4.85 N : 8,25 S : 6.35 EXAMPLE 23 Synthesis of [lS-[la, 3a, 7ß, 8ß, (2S*, 4S*)]]-2,2-dimethylbutanoic acid 1,2,3,7,8,8-hexahydro-3,7-dimethyl-8- [2- [tetrahydro-4- [ (3- methoxy-4-hydroxy-phenyl)-2-trans propenoyloxy]-6-oxo-2H-piran- 2-yl] ethyl]-1-naphthalenyl ester of formula (CCIV) starting from simvastatine of formula (XXI) and ferulic acid of formula (DII) Compound (CCIV) has been obtained according to the process of Example 8. Yield: 21% Elemental analysis Calculated : C : 70.68 H : 7.80 Found: C : 70.70 H : 7.82 EXAMPLE 24 Synthesisof S- [4-D-a-aminobenzylpenicillaminoyl] penicillamine of formula (CCV) starting from ampicillin of formula (XVI) and penicillamine of formula (CV) Compound (CCV) is synthetized according to the process of Example 9. Yield: 13% Elemental analysis Calculated : C : 52.48 H : 5.87 N : 11.66 S : 13.34 Found: C : 52.51 H : 5.90 N: 11.61 S : 13.30 EXAMPLE 25 Synthesis of 9- [ [2- [ (S)-a-amino-lH-imidazole-4-propanoyl-oxy] ethoxy]-methyl] guanine of formula (CCVI) starting from acyclovir of formula (XVII) and histidine of formula (PII) Compound (CCVI) has been obtained following the procedure of Example 19. Yield : 17% Elemental analysis Calculated : C : 50.14 H : 4.77 N : 27.29 Found: C : 50.17 H : 4.75 N : 27.22 EXAMPLE 26 Synthesis of [4-amino- [ (3-methoxy-4-hydroxy-phenyl)-2-trans propenoyl]-l-hyroxybutyliden] biphosphonic acid of formula (CCVII) starting from alendronic acid of formula (XXXVI) and ferulic acid of formula (DII) Compound (CCVII) has been obtained following the procedure of Example 8. Yield : 10% Elemental analysis Calculated : C : 39.54 H : 4.98 N : 3.29 P : 14.57 Found: C : 39.57 H : 5.01 N : 3.24 P : 14.56 EXAMPLE 27 Synthesis of 5-[[(S)-a-amino-lH-imidazole-4-propanoyl] amino]- 1,2,3,4-tetrahydroacridine of formula (CCVIII) starting from tacrine of formula (XXXV) and histidine of formula (PII) Compound (CCVIII) has been obtained according to the procedure of Example 19. Yield 15% Elemental analysis Calculated : C : 68.04 H : 6.31 N : 20.88 Found: C : 68.08 H : 6.37 N : 20.84 EXAMPLE 28 Synthesis of (8S-cis)-10 [ (3-amino,2,3,6-tri-deoxy-a-L-lyxo-exo pyranosyl) oxy]-7,8,9,10-tetrahydro, 6,8, 11-trihydroxy-8-[[[(3- methoxy-4-hydroxy-phenyl)-2-trans propenoyl-oxy-] methyl-oxo]-1- starting from doxorubicin of formula (XXXII) and ferulic acid of formula (DII) Compound (CCIX) has been obtained according to the procedure of Example 8. Yield 10% Elemental analysis Calculated : C : 61.75 H : 5.18 N : 1.95 Found: C : 61.81 H : 5.22 N : 1.90 EXAMPLE F7 Example F1 was repeated with three groups of rats (each group of of ten animals), all of them receiving NEM, and orally administered as it follows : a. control group : the vehicle formed of an aqueous suspension 1% w/v of carboxymethylcellulose, b. one group (group b-comparative) administered at the same time with 100 mg/Kg (0.48 mmoles/Kg) of ibuprofen + 79 mg/Kg (0.48 mmoles/Kg) of N-acetylcysteine in the same above vehicle, c. one group (group c) administered with 170.4 mg/Kg (0.48 mmoles/Kg) of the ester between indomethacin and N-acetyl cisteine (ref. ex. 2), in the above same vehicle.

The results are reported in Table VII and show that the mixture administered to group b (comparative) is less effective than the compound of the invention administered to group c in reducing gastric lesions.

Table I Test 1 : Gastric tolerability of drugs representative of the drug classes illustrated in the present invention in animals not treated or treated with NEM (oxidative stress conditions). The % incidence is calculated from the ratio between the number of animals found with gastric lesions and that total of the group. Compound dose (mg/Kg) Gastro-enteropathy /admin. route (% incidence) without NEM with NEM carrier _ Indomethacin 7.5/p. o. 0 100 Ambroxol 25/p. o. 0 80 Mesalamine 750/i. c. 0 60 Alendronate 15/p. o. 0 90 Tacrine 1/s. c. 0 100 Omeprazol 30/s. c. 0 0 Misoprostol 0.5/s. c. 0 0 p. o. = per os; i. c. = by intracolonic route; s. c. = by subcutaneous route.

Table II Test 2 : Inhibition of apoptosis (DNA fragmentation) induced by CIP in the endothelial cells in the presence of compounds representative of the drug classes illustrated in the present invention. Compound Apoptosis % with respect to the controls treated only with CIP Indomethacin 95 Paracetamol 120 Clopidogrel 110 Salbutamol 90 Ambroxol 70 Alendronate 160 Diphylline 95 Cetirizine 115 Enalapril 80 Nicotinamide 98 Ampicilline 94 Aciclovir 95 Mesalamine 74 Tacrine 90 Simvastatine 72 Omeprazol 90 Compound % Radical Inhibitionfrom Feil Blank 0 2-oxo-4-thiazolidin carboxylic acid 100 4-thiazolidin carboxylic acid 100 histidine 90 Table III Test 5 : Screening of the effectiveness of the listed substances to inhibit radical production induced by Fe Table IV<BR> Test 3 : Gastric tolerability (gastrointestinal damage incidence), hepatic (GP'<BR> pyruvic transainase dosage), and cardiovascular (blood pressure) of some com?<BR> represxentative of the drug classes llustrated in the present invention under @<BR> endothelial trouble induced by L-NAME.<BR> <P>The results relating to the blood pressure and GPT are expressed as % values c@<BR> those found in animals treated with the only carrier, without L-NAME. Compound dose mg/Kg Blood pressure % GPT % Gast@ /administ. route without with without with witho L-NAME L-NAME L-NAME L-NAME L-NA Carrier 100 152 100 155 0 Paracetamol 300/i.p. 108 155 180 500 20 Doxorubicin 1/i.p. 120 145 195 360 30 Simvastatine 50/p.o. 85 148 122 220 0 Omeprazol 30/s.c. 100 150 100 160 0 Misoprostol 0.5/s.c. 100 142 100 160 0 Table V Test 4: Screening of the effectiveness of the listed compounds in inhibiting radical production from DPPH Compound inhibition radical production from DPPH Solvent 0 N-acetylcysteine 100 Cysteine 100 Ferulic acid 100 (L)-carnosine 80 Gentisic acid 80 4-thiazolidincarboxylic 0 acid 2-oxo-4-thiazolidin 0 carboxylic acid histidine 0 Table VI Gastric tolerability of derivatives according to the present invention in comparison with that of the corresponding precursor drugs Treatment dose Gastropathy mg/Kg % incidence Carrier-30 diclofenac 10 100 diclofenac der. 10 10 (Ex. 15) piroxicam 10 100 piroxicam der. 10 0 (Ex. 14) aspirin 50 100 aspirin der. 50 0 (Ex. 13) Table VII Test on gastric tolerability following oral administration of NEM (Ex. F7) groups dose mg/Kg Gastropathy p.o. % incidence controls group b-comparative 100 (A) +79 (B) 60 mixture ibuprofen (A) + N-acetylcysteine (B) group c 170.4 10 ester of ibuprofen with N-acetylcysteine