The invention includes a compound of formula I:
wherein R
1
, X, Z, n, and m have any of the values described herein, as well as salts of such compounds, compositions comprising such compounds, and therapeutic methods that comprise the administration of such compounds. The compounds are inhibitors of PDE4 function and are useful for improving cognitive function in animals.
该发明包括式I的化合物:
其中R
1
,X,Z,n和m具有本文所述的任何值,以及这些化合物的盐,包含这些化合物的组合物,以及包括给予这些化合物的治疗方法。这些化合物是PDE4功能的
抑制剂,对于改善动物的认知功能是有用的。