Patent ID: 8865714

Claim:
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, 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; further wherein said substituents are selected from the group consisting of halogen, hydroxy, cyano, nitro, alkyl, halogenoalkyl, cycloalkyl, cycloalkyl-alkyl, aralkyl, alkenyl, alkynyl, alkoxy, halogenoalkoxy, cycloalkoxy, cycloalkyl-alkoxy, aralkyloxy, alkylthio, cycloalkyl-alkylthio, amino, mono- or di-alkylamino, cycloalkyl-alkylamino, acyl, acyloxy, oxo, carboxy, alkoxycarbonyl, aralkyloxycarbonyl, carbamoyl, saturated or unsaturated heterocyclic groups, aromatic hydrocarbon, and saturated heterocycloxy groups; and wherein the carbamoyl is selected from the group consisting of CONH 2 , (mono- or di-alkyl)carbamoyl, (mono- or di-aryl)carbamoyl, (N-alkyl-N-aryl)carbamoyl, pyrrolidinocarbamoyl, piperidinocarbamoyl, piperazinocarbaomyl, and morpholinocarbamoyl.