Compounds of general formula I:
1
or pharmaceutically or veterinarily acceptable salts, solvates, polymorphs or pro-drugs thereof wherein:
wherein R
1
, R
2
, R
3
, R
4
, X 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:1的化合物:其中R1,R2,R3,R4,X和A具有所述含义,其为治疗和预防需要抑制环状
鸟苷酸3',5'-一
磷酸酯酶(例如cGMP PDE5)的医疗情况有用的药用或兽医可接受的盐,溶剂化合物,多晶体或前药。