FUSED HETEROCYCLIC COMPOUNDS

摘要

A compound represented by the formula wherein ring A is an optionally substituted 5- to 10-membered aromatic ring; R>1< AND R>2< are the same or different and each is an optionally substituted hydrocarbon group or an optionally substituted heterocyclic group; X and Y are the same or different and each is a bond, -O-, -S-, -SO-, -SO?2#191- or -NR>3<- (R>3< is a hydrogen atom or an optionally substituted hydrocarbon group); and L is a divalent hydrocarbon group, or a salt thereof shows a superior peptidase-inhibitory activity and is useful as a prophylactic or therapeutic agent of diabetes and the like.