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.
提供了式 IA 和式 IB 的化合物、
其中 R1、R2、R3、Het1 和 X 具有描述中给出的含义,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。