| abstract |
The invention relates to compounds of formula (I) and pharmaceutically acceptable salts thereof, wherein R, R1 and R2 are as defined herein. The invention further relates to pharmaceutical compositions containing, and methods of using, the compounds of formula (I), or acceptable salts thereof, for the inhibition of phosphodiesterase (PDE) type IV or the production of tumor necrosis factor (TNF) in a mammal. |