| 摘要 |
Novel compound of the formula: <IMAGE> wherein R1 is pyridyl group, R2 is a phenyl group, a thienyl group, a furyl group, a naphthyl group, a benzothienyl group or pyridyl group, which may optionally have a lower alkoxy group, a lower alkyl group, a halogen atom, trifluoromethyl group, a lower alkenyl group or methylenedioxy group, R3 is hydrogen atom or a lower alkyl group, and n is an integer of 0 to 6, Y is sulphur atom, methylene group or a group of the formula: <IMAGE> wherein R4 is hydrogen atom or acetyl group, and m is 0 or 1, and their pharmaceutically acceptable salts have an inhibitory action on bio-synthesis of thromboxane A2(TXA2) and an effect of accelerating the productivility of prostaglandin I2(PGI2), and can be used for mammals to the prophylaxis or therapy of thrombosis caused by platelet aggregation or ischemic diseases caused by vasospasms in cardiac, cerebral and peripheral circulatory system (e.g. cardiac infarction, apoplexy, infarct of blood vessels in kidney, lung and other organs, pectic ulcer, etc.).
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