Compounds of general formula (I):
wherein R1, R2, R3, R4, X, Y and A have the meanings given herein which are useful in the curative and prophylactic treatment of a medical condition for which inhibition of a cyclic guanosine 3',5'-monophosphate phosphodiesterase (e.g. cGMP PDE5) is desired.
通式(I)化合物:
其中 R1、R2、R3、R4、X、Y 和 A 具有本文给出的含义,这些化合物可用于治疗和预防需要抑制环
鸟苷-3',5'-单
磷酸磷酸二酯酶(如 cGMP PDE5)的病症。