Heterocyclic compounds

摘要

Heterocyclic compounds of the general formula: <IMAGE> (I) R represents a general formula: G-E-D-B-A- G represents a carbocyclic or heterocyclic ring which is unsubstituted or substituted, L represents a group of general formula: -CO-COR2 -CO-CH2-COR2 -CO-CF2-COR2 -CO-CO-NR5R6 or -CO-CH2-CO-NR5R6 and non-toxic salt or hydrate thereof possess an inhibitory activity on propyl endopeptidase, and therefore usefull for prevention and/or treatment of amnesia.