The following general formula (I) [Formula 1] (I) [Wherein, R1 represents an alkyl group 1-6 carbon atoms, which may have a hydroxyl group, a substituent 1-6 alkyl carbon atoms, R2 is - (C = O) -N (R3) (R4 ) group, or - indicate either (C = O) of -OR5 groups, same or different, R3, R4 is the number 1 to 6 alkyl group carbon atoms which may have a hydrogen atom or a substituent, or shown may, R4 and R3 is C1-C6 alkyl carbon atoms which may have a substituent R5 or a hydrogen atom, a saturated heterocyclic group together with the nitrogen atom to which they are attached It represents a group, n is 1 or 2. ] Or a salt thereof piperazine compound represented by the formula.下記一般式(I)【化1】(I)[式中、R1は炭素数1~6アルキル基を示し、R2は水酸基、置換基を有していてもよい炭素数1~6アルキル基、-(C=O)-N(R3)(R4)基、又は -(C=O)-OR5 基のいずれかを示し、R3、R4は同一又は相異なって、水素原子、又は置換基を有していてもよい炭素数1~6アルキル基を示すか、R3とR4はそれらが結合する窒素原子と一緒になって飽和複素環基を形成してもよく、R5 は水素原子、又は置換基を有していてもよい炭素数1~6アルキル基を示し、nは1又は2を示す。]で表されるピペラジン化合物又はその塩。
