Compounds of a certain formula 1, in which R1, R2, R3, R4, R5, R6 and n have the meanings indicated in the description, are novel effective PDE3/4 inhibitors.
The compounds of formula I
in which R1, R2, R3, R4, R5, R6 and n have the meanings as indicated in the description, are novel effective PDE3/4 inhibitors.