The invention relates to compounds of the formula I ##STR1## and pharmaceutically acceptable salts thereof, wherein R, R.sub.1, and R.sub.2, 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.
本发明涉及式I化合物 ##STR1## 及其药学上可接受的盐,其中R、R1和R2如本文所定义。本发明还涉及含有式I化合物或其可接受盐的药物组合物,以及使用这些化合物或其可接受盐来抑制哺乳动物中
磷酸二酯酶(PDE)类型IV或肿瘤坏死因子(TNF)产生的方法。