A compound represented by the formula: wherein R 1 in the number of n are each independently hydrogen atom, halogen atom, or two R 1 bonded to the adjacent carbon atoms on a benzene ring are optionally joined to form C 1-4 alkylenedioxy optionally substituted by substituent(s) selected from substituent group α, R 2 is C 1-12 alkyl optionally substituted by substituent(s) selected from substituent group α, C 2-6 alkenyl optionally substituted by substituent(s) selected from substituent group α, C 2-6 alkynyl optionally substituted by substituent(s) selected from substituent group α, C 3-7 cycloalkyl optionally substituted by substituent(s) selected from substituent group α, aryl optionally substituted by substituent(s) selected from substituent group α, aryl C 1-6 alkyl optionally substituted by substituent(s) selected from substituent group α, or heterocyclyl group optionally substituted by substituent(s) selected from substituent group α, R 3 is hydrogen atom, n is an intenger of 1 - 4, and the substituent group α consists of halogen atom, hydroxy, optionally substituted amino, carboxy, C 1-6 alkoxycarbonyl, sulfo group, phosphoric acid group, di C 1-6 alkyl phosphoric acid group, cyano, optionally substituted C 1-6 alkyl, C 3-7 cycloalkyl, C 3-7 cycloalkyl C 1-6 alkyl, optionally substituted C 1-6 alkoxy, C 1-6 alkylthio, optionally substituted aryl, optionally substituted aryloxy, aryl C 1-6 alkoxy, optionally substituted heterocyclyl group, optionally substituted C 1-6 alkylcarbonyl, heterocyclylcarbonyl, optionally substituted C 1-6 alkylcarbonyloxy, optionally substituted C 3-7 cycloalkylcarbonyloxy, arylcarbonyloxy, heterocyclylcarbonyloxy, optionally substituted C 1-6 alkoxycarbonyloxy, optionally substituted heterocyclyl C 1-6 alkoxycarbonyloxy, C 3-7 cycloalkyloxycarbonyloxy, heterocyclyloxycarbonyloxy, optionally substituted heterocyclyloxy, tri C 1-6 alkylammonio, optionally substituted C 1-6 alkylsulfonyl and C 1-6 alkylsulfamoylcarbonyl, or a pharmaceutically acceptable salt thereof. R 1 in the number of n are each independently hydrogen atom, halogen atom, or two R 1 bonded to the adjacent carbon atoms on a benzene ring are optionally joined to form C 1-4 alkylenedioxy optionally substituted by substituent(s) selected from substituent group α, R 2 is C 1-12 alkyl optionally substituted by substituent(s) selected from substituent group α, C 2-6 alkenyl optionally substituted by substituent(s) selected from substituent group α, C 2-6 alkynyl optionally substituted by substituent(s) selected from substituent group α, C 3-7 cycloalkyl optionally substituted by substituent(s) selected from substituent group α, aryl optionally substituted by substituent(s) selected from substituent group α, aryl C 1-6 alkyl optionally substituted by substituent(s) selected from substituent group α, or heterocyclyl group optionally substituted by substituent(s) selected from substituent group α, R 3 is hydrogen atom, n is an intenger of 1 - 4, and the substituent group α consists of halogen atom, hydroxy, optionally substituted amino, carboxy, C 1-6 alkoxycarbonyl, sulfo group, phosphoric acid group, di C 1-6 alkyl phosphoric acid group, cyano, optionally substituted C 1-6 alkyl, C 3-7 cycloalkyl, C 3-7 cycloalkyl C 1-6 alkyl, optionally substituted C 1-6 alkoxy, C 1-6 alkylthio, optionally substituted aryl, optionally substituted aryloxy, aryl C 1-6 alkoxy, optionally substituted heterocyclyl group, optionally substituted C 1-6 alkylcarbonyl, heterocyclylcarbonyl, optionally substituted C 1-6 alkylcarbonyloxy, optionally substituted C 3-7 cycloalkylcarbonyloxy, arylcarbonyloxy, heterocyclylcarbonyloxy, optionally substituted C 1-6 alkoxycarbonyloxy, optionally substituted heterocyclyl C 1-6 alkoxycarbonyloxy, C 3-7 cycloalkyloxycarbonyloxy, heterocyclyloxycarbonyloxy, optionally substituted heterocyclyloxy, tri C 1-6 alkylammonio, optionally substituted C 1-6 alkylsulfonyl and C 1-6 alkylsulfamoylcarbonyl, or a pharmaceutically acceptable salt thereof.