1-(3-mercapto-2-methylpropanoyl) prolyl amino acid derivatives and salts thereof, processes for their preparation and pharmaceutical compositions containing such compounds

Abstract From the Canadian patent

Abstract of the Disclosure, 1-(3-Mercapto-2-methylpropanoyl)prolyl amino acid derivatives of the formula, wherein R represents a hydrogen atom a lower alkyl group, a phenyl-lower alkyl group or a substituted phenyl-lower alkyl group, R1 represents a hydrogen atom R4CO-, R5S-, or , R2 represents a hydrogen atom or a lower alkyl group, R3 represents a hydrogen atom a phenyl group, a lower alkyl group, or a substituted lower alkyl group or, R2 and R3 form a heterocyclic ring together with the nitrogen and carbon atoms to which they are respectively bonded; salts of these compounds; compositions comprising these compounds or salts; and processes for preparing these compounds or salts. These …