abstract |
Compounds of formula (Ia) where Xa is CH or nitrogen, Either oxygen or sulfur, R1a and R2a are specific specific substances, R3a, R4a and R5a are the same or different, hydrogen, halogen, cyano, lower alkoxy or lower alkoxy substituted aralkyl; or R3a, R4a, and R5a combine to form lower alkylenedioxy, and m is 1 or 2, useful as cGMP-PDE inhibitors. |