Compounds of a certain formula (1), in which R1, R2, R3, R31, R4, R5, R6 and R7 have the meanings indicated in the description, are novel effective PDE4 inhibitors in which R7 is a radical of formulae (a), (b), (c) or (d).
某种
化学式(1)的化合物中,其中R1、R2、R3、R31、R4、R5、R6和R7具有描述中指示的含义,是一种新颖有效的PDE4
抑制剂,其中R7是
化学式(a)、(b)、(c)或(d)的基团。