Compounds of general formula (I):
1
wherein R
1
, R
2
, R
3
, R
4
, 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)的化合物:其中R1、R2、R3、R4、X、Y和A具有下文所给出的含义,这些化合物对于治疗和预防需要抑制循环
鸟苷3′,5′-
磷酸二酯酶(例如cGMP PDE5)的医疗状况是有用的。