This invention relates to a piperazine compound represented by Formula (I),wherein R1 is C1-6 alkyl；R2 is hydroxy, C1-6 alkyl that may have one or more substituents, —(C═O)—N(R3)(R4), or —(C═O)—OR5；R3 and R4 are the same or different, and each represents hydrogen or C1-6 alkyl that may have one or more substituents, orR3 and R4, taken together with a nitrogen atom to which R3 and R4 are attached, may form a saturated heterocyclic group；R5 is hydrogen or C1-6 alkyl that may have one or more substituents； andn is 1 or 2；or a salt thereof.
