There is provided compounds of formula IA and of formula IB,
wherein R1, R2, R3, Het1 and X have meanings given in the description, which are useful in the curative and prophylactic treatment of medical conditions for which inhibition of a cyclic guanosine 3′,5′-monophosphate phosphodiesterase (e.g. cGMP PDE5) is desired.
提供了化合物的结构式IA和结构式IB,其中R1、R2、R3、Het1和X的含义如描述中所示,这些化合物在治疗和预防需要抑制环状
鸟苷3′,5′-单
磷酸磷酸二酯酶(例如cGMP PDE5)的医疗状况方面是有用的。