The present invention provides a compound having a cholinergic muscarinic M1 receptor positive allosteric modulator activity, and useful as a prophylactic or therapeutic drug for Alzheimer's disease, schizophrenia, pain, a sleep disorder and the like. The present invention relates to a compound represented by the formula (I): wherein R 1 is an optionally substituted amino group or an optionally substituted cyclic amino group, R 2 and R 3 are each independently a hydrogen atom or a substituent, X is -CH= or - N=, and ring A is an optionally substituted 5- to 10-membered ring, or a salt thereof.
