Novel heterocyclic compounds having platelet aggregation inhibitory effects

摘要

Disclosed are a compound represented by the following formula (I) and pharmacologically acceptable salt and solvate thereof having inhibitory activity against platelet aggregation: CHEM wherein A represents the following formula (II), (III), or (IV): CHEM A pharmaceutical composition comprising the above compound can be utilized as a platelet aggregation inhibitor that possesses excellent inhibitory activity against platelet aggregation, is free from hemorrhage and other side effects such as those derived from selectivity for the inhibitory action, and is potent against vasculature lesions, such as vasospasm.