COMPOUNDS WHICH HAVE ACTIVITY AT M1 RECEPTOR AND THEIR USES IN MEDICINE

摘要

Compounds of formula (I) or a salt thereof are provided: wherein R4, R6, R7, R8, Q, A, Y, n and R are as defined in the description. Use of the compounds for treating psychotic disorders, cognitive impairments and Alzheimer's Disease are disclosed. The invention further discloses pharmaceutical compositions comprising the compounds.