Patent ID: 8778970

Claim:
A compound represented by a formula (1) or a pharmaceutically acceptable salt thereof: wherein R 1 represents a hydrogen atom or a group represented by a formula (2): wherein R 3 represents a hydrogen atom or a methyl group; R 2 represents a chlorine atom bonded at the p-position, a bromine atom bonded at the p-position, a methyl group bonded at the p-position, a chlorine atom bonded at the m-position or a bromine atom bonded at the m-position, with respect to a methylene group bonded to a piperidine ring; Y 1 represents a hydrogen atom, and Y 2 represents a hydrogen atom or a hydroxy group or Y 1 and Y 2 together represent an oxo group; and Z represents a group represented by a formula (3-1-1), (3-1-2), (3-2-1), (3-2-2), (3-3-1), (3-3-2), (3-4-1) or (3-4-2): wherein when R 1 represents a group represented by the formula (2) and each of Y 1 and Y 2 represents a hydrogen atom, Z represents a group selected from the group consisting of the formulas (3-1-2), (3-2-1), (3-2-2), (3-3-1), (3-3-2), (3-4-1) and (3-4-2).