Compounds of formula I wherein R1, R2, R3, R4 and R5 have the means set forth in the description are selective cyclic nucleotide phosphodiesterase (PDE) inhibitors (specifically of type 4), which are effective bronchial therapeutics.
化学式为I的化合物,其中R1、R2、R3、R4和R5的平均值如描述中所述,是选择性环状核苷酸
磷酸二酯酶(PDE)
抑制剂(特别是类型4),是有效的支气管治疗药物。