received by the International Bureau on 12 August 2020 (12.08.2020)

I/we claim:

1. A formulation in pharmaceutically acceptable form suitable for administration to a patient containing an excipient and a HtrA inhibitor having Formula (I):

wherein:

Ri is H, halo, cyano, OH, (C₁-C₆)alkyl, (C₃-C₁₀)heterocyclo, (C₃-C₁₀)cycloalkyl, aryl, or heteroaryl, any of which may be optionally substituted with 1 or more R^w groups as allowed by valence selected from the groups listed in Table 1 ;

R2 is H, halo, cyano, OH, (C₁-C₆)alkyl, (C₂-C₈)alkenyl. (C₁-C₆)alkoxy, (C₃- C₁₀)heterocyclo, (C₃-C₁₀)cycloalkyl, aryl, or heteroaryl, any of which may be optionally substituted with 1 or more R^w groups as allowed by valence;

R3 is H, halo, cyano, OH, (C₁-C₆)alkyl, (C₂-C₈)alkenyl. (C₂-C₈)carboxyalkyl; N-(C₁- C₆)alkylaminocarbonyl, (C₁-C₆)alkoxy, (C₁-C₆)sulfonyl, (C₃-C₁₀)heterocyclo, (C₃- C₁₀)cycloalkyl, aryl, or heteroaryl, any of which may be optionally substituted with 1 or more R^w groups as allowed by valence;

R4 is H, halo, cyano, OH, (C₁-C₆)alkyl, (C₂-C₈)alkenyl. (C₂-C₈)carboxyalkyl; N-(C₁- C₆)alkylaminocarbonyl, (C₁-C₆)alkoxy, (C₁-C₆)sulfonyl, (C₃-C₁₀)heterocyclo, (C₃- C₁₀)cycloalkyl, aryl, or heteroaryl, any of which may be optionally substituted with 1 or more R^w groups as allowed by valence;

R₅ is H, halo, cyano, OH, (C₁-C₆)alkyl, (C₂-C₈)alkenyl. (C₂-C₈)carboxyalkyl; N-(C₁- C₆)alkylaminocarbonyl, (C₁-C₆)alkoxy, (C₁-C₆)sulfonyl, (C₃-C₁₀)heterocyclo, (C₃- C₁₀)cycloalkyl, aryl, or heteroaryl, any of which may be optionally substituted with 1 or more R^w groups as allowed by valence;

Re is H, halo, cyano, OH, (C₁-C₆)alkyl, (C₂-C₈)alkenyl, (C₂-C₈)carboxyalkyl : N-(C₁- C₆)alkylaminocarbonyl, (C₁-C₆)alkoxy, (C₁-C₆)sulfonyl, (C₃-C₁₀)heterocyclo, (C₃- C₁₀)cycloalkyl, aryl, or heteroaryl, any of which may be optionally substituted with 1 or more R^w groups as allowed by valence;

R^w at each occurrence is independently H, halo, cyano, nitro, oxo, amino, alkyl, haloalkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, heterocyclo, aryl, heteroaryl, arylalkyl, heteroarylalkyl, cycloalkylalkyl, heterocycloalkyl, wherein said alkyl, haloalkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, heterocyclo, aryl, heteroaryl, arylalkyl, heteroarylalkyl, cycloalkylalkyl, and heterocycloalkyl groups may be further independently substituted with one or more groups selected from the group consisting of halo, cyano, oxo(C₃-C₁₀)heterocyclo, (C₃-C₁₀)cycloalkyl, -(CH₂)_n-(C₃- C10) cycloalkyl, -(CH₂)n-(C₃-C₁₀)heterocyclo, -(CH₂)aryl, -(CH₂)_n-heteroaryl, aryl, and heteroaryl, wherein n is 0, 1, 2, 3, 4, 5, or 6.

2. The formulation of claim 1, wherein Ri is selected from the groups listed in Table 1;

R2 is selected from the groups listed in Table 2; R3 is selected from the groups listed in Table 3; R4 is selected from the groups listed in Table 4; R5 is selected from the groups listed in Table 5; and R6 is selected from the groups listed in Table 6.

3. A formulation in pharmaceutically acceptable form suitable for administration to a patient containing an excipient and a HtrA inhibitor selected from the group consisting of:

N'-benzyl-N-[2-[(2R)-l-(4-methylphenyl)sulfonylpiperidin-2-yl]ethyl]oxamide; l-[2-[methyl(naphthalen-2-ylsulfonyl)amino]acetyl]piperidine-4-carboxamide; 8-(4-methylphenyl)sulfonyl-4-(2,4,6-trimethylphenyl)sulfonyl-l-oxa-4,8- diazaspiro [4.5] decane ;

N- { 1 -[2-(2-Biphenylyloxy)ethyl] -3 -pyrrolidinyl} -3 ,4-difluorobenzenesulfonamide ; l-(2-Anthrylsulfonyl)-3-piperidinecarboxylic acid;

(3 S) - 1 -Carbamimidoy 1-N -({(2S)-1-[N -(2-naphthylsulfonyl)glycyl] -2- pyrrolidinyl } methyl) -3 -piperidinecarboxamide ;

(3 S) - 1 -Carbamimidoy 1-N -({(2S)-1-[N -(2-naphthylsulfonyl)-L-alanyl] -2- pyrrolidinyl } methyl) -3 -piperidinecarboxamide ; Cyclohexyl [4-( 1 -naphthylsulfonyl)-2-(trifluoromethyl)- 1 -piperazinyl]methanone; and 2-[(8S,l lR)-l l-{(lR)-l-hydroxy-2-[(3-methylbutyl)(phenylsulfonyl)amino]ethyl}- 6,9-dioxo-2-oxa-7, 10-diazabicyclo [ 11.2 2]heptadeca- 1(15), 13,16-trien-8- yl] acetamide.

4. A method of treating a bacterial infection comprising administering a

pharmaceutically effective amount of the HtrA inhibitor of any of claims 1-3 to a human subject in need thereof.

5. The method of claim 4, wherein the bacterial infection is a Helicobacter pylori

infection.

6. A CagA inhibitor having the sequence of X1X2X3X4X5X6X7X8X9X10X1 1X12; wherein:

Xi is D, R, H, I, F, P, W, or Y;

X2 is T or N;

X3 is D, N, or Y;

X4 is P, E, L, orY;

X5 is T, R, or L;

X6 is A or S;

X7 is P, R, E, I, or L;

X8 is P, I, L, or W;

X9 is F, or Y;

X10 is D, F, or W;

X1 1 is S, A, D, E, H, I, L, or Y; and

X12 1S L, A, N, W, orY.

7. The CagA inhibitor of claim 6, having the sequence of DTDPTAPPYDSL.

8. The CagA inhibitor of claim 6, having the sequence listed in Table 13.

9. A CagA inhibitor having the sequence at least 80% identity to any of the sequence of SEQ ID NOs: 1-38, lised in Table 13.

10. A method of treating gastric cancer comprising administering a pharmaceutically effective amount of the CagA inhibitor of any of claims 6-9 to a human subject in need thereof.

11. A method of inhibiting, down-regulating, reducing and/or killing pathogenic bacteria comprising steps of:

a. Screening a microorganism that produces an antibacterial compound; b. Conducting structural analysis of the antibacterial compound;

c. Modifying the antibacterial compound to improve the affinity to target

bacteria.

12. The method of claim 11, wherein BLAST, FASTA or CLUSTAL is used for sequence analysis in step a).

13. The method of claim 11, wherein at least one amino acid of the antibacterial

compound is mutated in step c).

14. The method of claim 11, where the structural analysis is performed using solvent- accessible surface area.

15. The method of claim 11, wherein the antibacterial compound is Salivaricin A,

Ruminococcin A, or Bacteriocin staphylococcus 188.