There is provided compounds of formula IA and of formula IB,
wherein R1, R2, R3, R4 and A have meanings given in the description, 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.
提供了式IA和式IB的化合物,
其中R1、R2、R3、R4和A的含义如描述中所示,在治疗和预防需要抑制环状
鸟苷3′,5′-单
磷酸酯酶(例如cGMP PDE5)的医疗状况中非常有用。