The compounds of the formula ##STR1## and the pharmaceutically acceptable salts thereof; wherein X.sub.1, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are as defined herein, are inhibitors of PDE IV and the production of tumor necrosis factor. As such, they are active in the treatment of inflammatory diseases, shock etc.
该式化合物及其药学上可接受的盐,其中X1、R1、R2、R3和R4的定义如本文所述,均为PDE IV酶和肿瘤坏死因子的
抑制剂。因此,它们在治疗炎症性疾病、休克等方面具有活性。