PURPOSE: To obtain the titled substance, by acetylating 2-hydroxy-3-(2'-aminophenylthio)-3-(4"-methoxyphenyl)-propionic acid, subjecting the resultant compound to ring closure, reacting the reaction product with N,N-dimethylaminoethyl chloride.

CONSTITUTION: 1mol compound shown by the formula I is reacted with about 2mol acetyl chloride in a solvent such as chloroform, benzene, etc. at 0°CWthe reflux temperature for about 1hr to give a compound shown by the formula II, which is reacted with an equipmolar amount or a little excess amount of acetyl chloride at 90°CWthe reflux temperature of the solvent under heating, to give a compound shown by the formula III. 1mol of this compound and 2W3mol KHCO3 are suspended in methyl ethyl ketone, and reacted with ClCH2N(CH3)2 with stirring under reflux for 10W15hr, to give a compound shown by the formula IV.

USE: A coronary vasodilator, or a stimulant for electroencephalogram.