abstract |
The invention relates to compounds of formula (I), in free or salt form, where R1 is a monovalent aromatic group having up to 10 carbon atoms, and R2 is a cycloaliphatic group having up to 8 ring carbon atoms. Compositions containing them, methods for their preparation and their use as phosphodiesterase isoenzyme 4 (PDE4) inhibitors are also described. |