NEW TRIPEPTIDE DERIVATIVES HAVING A POLYCYCLIC NITROGENOUS STRUCTURE, PROCESS OF THE PREPARATION THEREOF AND PHARMACEUTICAL COMPOSITIONS CONTAINING THEM

摘要

Compounds of general formula: …… in which:… X denotes… either an oxygen atom,… or two hydrogen atoms;… Y denotes… either a hydrogen atom… or a hydroxyl group;… or Y denotes an amino group on condition that X denotes two hydrogen atoms.… R denotes a hydrogen atom, an alkyl group of 1 to 6 carbon atoms in a straight or branched chain, optionally substituted by one or more hydroxyl, amino, mercapto, methylthio, carboxyl or aryl groups such as phenyl, pyridyl or thienyl. …… denotes a nitrogen-containing polycyclic structure, their enantiomers, epimers and diastereoisomers and their addition salts with a pharmaceutically acceptable acid or base. …Medications.