| abstract |
A compound represented by the general formula (I): (I) (wherein R1 represents C1-6 alkyl, etc.; R2 represents hydrogen, C2-7 alkanoyl, C7-11 arylcarbonyl, the formula R4-(CH2)l-, etc.; R3 represents C6-10 aryl, etc.; X1, X2, X3, X4, and X5 each independently represents hydrogen, halogeno, etc.; and n is an integer of 0 to 2), a pharmacologically acceptable salt of the compound, or a prodrug of either. They have excellent platelet activation inhibitory activity, etc. and are useful as a preventive or therapeutic agent for thromboembolization diseases. |