| 摘要 |
This invention relates to compounds of formula (IA), (IB), (IC) or (ID), wherein m, X, Z, R2, R3, R4, R5, R6, R14 and the dotted lines are as defined below, their pharmaceutically acceptable salts, pharmaceutical compositions containing them and methods of using them to neat Alzheimer's disease, age-associated memory impairment, Parkinson's disease and other central nervous system disorders. The claimed compounds have the ability to enhance the release of neurotransmitters such as acetylcholine, dopamine and serotonin. |
