Compounds of the formula
1
wherein R
1
R
2
, R
7
, R
8
, X, Y, M and L are defined as below. The compounds of formula I are cholinesterase inhibitors and are useful in enhancing memory in patients suffering from dementia and Alzheimer's disease.
化合物的式子为1,其中R1、R2、R7、R8、X、Y、M和L的定义如下。式I的化合物是
胆碱酯酶抑制剂,并可用于增强患有痴呆和阿尔茨海默病的患者的记忆力。