| abstract |
PROBLEM TO BE SOLVED: To have an antagonism of NMDA receptor including NR2B subunit, and to be useful as a prophylactic or therapeutic agent for major depression, bipolar disorder, migraine, pain, peripheral symptoms of dementia and the like. To provide a heterocyclic compound. Equation (I): [In the formula, each symbol is as described in the specification. ] A compound represented by or a salt thereof. [Selection diagram] None |