Patent ID: 8232405

Claim:
A compound represented by the formula (1) or a pharmaceutically acceptable salt thereof: wherein R 1 represents a hydrogen atom or a methyl group; R 2 represents a chlorine atom bonded at the p-position in relation to a methylene group bonded to the piperidine ring, a bromine atom bonded at the p-position in relation to a methylene group bonded to the piperidine ring, a methyl group bonded at the p-position in relation to a methylene group bonded to the piperidine ring, a chlorine atom bonded at the m-position in relation to a methylene group bonded to the piperidine ring, or a bromine atom bonded at the m-position in relation to a methylene group bonded to the piperidine ring; X represents a methylene group or an oxygen atom; and n represents an integer of 1 to 3.