The compounds of formula (I)
wherein R1 to R8 and R11 have the meanings as given in the description, the salts thereof, the N-oxides of the compounds and the salts thereof, and the stereoisomers of the compounds, the salts, the N-oxides of the compounds and the N-oxides of the salts thereof are effective inhibitors of the type 5 phosphodiesterase.
式(I)中的化合物,其中R1至R8和R11的含义如描述中所示,其盐,化合物的N-氧化物及其盐,化合物的立体异构体,盐,化合物的N-氧化物及其盐的N-氧化物是有效的第5型
磷酸二酯酶抑制剂。