The compounds of Formula (1),
in which A, R1, R2, R3 and R5 have the meanings as given in the description, are novel effective inhibitors of type 4 and 5 phosphodiesterase.
The compounds of formula (1)
in which A, X, R1, R2, R3 and R7 have the meanings as given in the description, are novel effective inhibitors of type 4 and type 5 phosphodiesterase.