3,6-Disubstituted pyridazine derivatives

摘要

A 3,6-disubstituted pyridazine derivative having excellent platelet agglutination inhibitory effects. It is useful for a preventive medicine or a therapeutic medicine for a cerebrovascular disorder such as cerebral thrombosis and cerebral embolism, an ischemic heart disease such as myocardial infarction, and a circulation disorder such as a peripheral circulation disorder. A pharmaceutical composition containing a composition of the present invention as an effective ingredient and a process for preparing the same are also disclosed.