This invention relates to a piperazine compound represented by Formula (I), wherein R 1 is C 1-6 alkyl； R 2 is hydroxy, C 1-6 alkyl that may have one or more substituents, -(C=O)-N(R 3 )(R 4 ), or -(C=O)-OR 5 ； R 3 and R 4 are the same or different, and each represents hydrogen or C 1-6 alkyl that may have one or more substituents, or R 3 and R 4 , taken together with a nitrogen atom to which R 3 and R 4 are attached, may form a saturated heterocyclic group； R 5 is hydrogen or C 1-6 alkyl that may have one or more substituents； and n is 1 or 2； or a salt thereof.一種哌化合物或其鹽，該哌化合物係以下述通式(I)所表示者：[化1](I)[式中，R1係表示碳數1~6烷基，R2係表示羥基、可具有取代基之碳數1~6烷基、-(C=O)-N(R3)(R4)基、或-(C=O)-OR5基之任一者，R3、R4係相同或相異，表示氫原子、或可具有取代基之碳數1~6烷基，或R3與R4亦可與其等所鍵結之氮原子一起而形成飽和雜環基，R5係表示氫原子、或可具有取代基之碳數1~6烷基，n係表示1或2。]
