abstract |
Piperidine derivatives represented by formula (I) or nontoxic salts thereof (wherein symbols are defined in the description). Since the compound represented by formula (I) has a PDE4 inhibitory activity, it is useful for preventing and/or treating inflammatory diseases, diabetic diseases, allergic diseases, autoimmune diseases, osteoporosis, bone fracture, obesity, depression, Parkinson's disease, ischemia-reperfusion injury, leukemia and the like. |