A compound represented by the following formula (I-a): (wherein R 0 is the -NR 3 R 4 group (wherein R 3 and R 4 are each independently a hydrogen atom, an oxygen atom, an unsubstituted or halogen-substituted straight-chain, branched or cyclic alkyl group having 1 to 5 carbon atoms, or a straight-chain or branched alkyloxycarbonyl group having 2 to 10 carbon atoms); R 1 and R 2 are each independently a hydrogen atom, a halogen atom, a hydroxyl group, a straight-chain or branched alkoxy group having 1 to 5 carbon atoms, an acetyl group, a carbamoyl group, a carboxyl group, a straight-chain or branched ester group having 1 to 5 carbon atoms, an unsubstituted or halogen-substituted straight-chain, branched or cyclic alkyl group having 1 to 5 carbon atoms, or an -NR 3 R 4 group (wherein R 3 and R 4 are each independently a hydrogen atom, an oxygen atom, an unsubstituted or halogen-substituted straight-chain, branched or cyclic alkyl group having 1 to 5 carbon atoms, or a straight-chain or branched alkyloxycarbonyl group having 2 to 10 carbon atoms); R 5 and R 6 are each independently a hydrogen atom, or an unsubstituted or halogen-substituted straight-chain, branched or cyclic alkyl group having 1 to 5 carbon atoms; R 7 is a straight-chain, branched or cyclic alkyl group having 1 to 5 carbon atoms; E is an oxygen atom; n is an integer of 0 to 5; X and Y are each independently a connecting bond; a straight-chain or branched alkylene group having 1 to 5 carbon atoms, either unsubstituted or substituted with 1 to 4 hydroxyl or alkoxy groups; a cycloalkylene group having 3 to 6 carbon atoms, either unsubstituted or substituted with 1 to 4 hydroxyl groups, oxygen atoms or alkyl groups; a hetero-cycloalkylene group, either unsubstituted or substituted with 1 to 4 hydroxyl groups, oxygen atoms or alkyl groups; an alkenylene group having 2 to 4 carbon atoms, either unsubstituted or substituted with 1 to 4 alkyl groups having 1 to 5 carbon atoms; -NHCO-; -CONH-; -CO-; or -SO 2 -; and Q is a hydrogen atom), or a pharmaceutically acceptable salt thereof. R 0 is the -NR 3 R 4 group (wherein R 3 and R 4 are each independently a hydrogen atom, an oxygen atom, an unsubstituted or halogen-substituted straight-chain, branched or cyclic alkyl group having 1 to 5 carbon atoms, or a straight-chain or branched alkyloxycarbonyl group having 2 to 10 carbon atoms); R 1 and R 2 are each independently a hydrogen atom, a halogen atom, a hydroxyl group, a straight-chain or branched alkoxy group having 1 to 5 carbon atoms, an acetyl group, a carbamoyl group, a carboxyl group, a straight-chain or branched ester group having 1 to 5 carbon atoms, an unsubstituted or halogen-substituted straight-chain, branched or cyclic alkyl group having 1 to 5 carbon atoms, or an -NR 3 R 4 group (wherein R 3 and R 4 are each independently a hydrogen atom, an oxygen atom, an unsubstituted or halogen-substituted straight-chain, branched or cyclic alkyl group having 1 to 5 carbon atoms, or a straight-chain or branched alkyloxycarbonyl group having 2 to 10 carbon atoms); R 5 and R 6 are each independently a hydrogen atom, or an unsubstituted or halogen-substituted straight-chain, branched or cyclic alkyl group having 1 to 5 carbon atoms; R 7 is a straight-chain, branched or cyclic alkyl group having 1 to 5 carbon atoms; E is an oxygen atom; n is an integer of 0 to 5; X and Y are each independently a connecting bond; a straight-chain or branched alkylene group having 1 to 5 carbon atoms, either unsubstituted or substituted with 1 to 4 hydroxyl or alkoxy groups; a cycloalkylene group having 3 to 6 carbon atoms, either unsubstituted or substituted with 1 to 4 hydroxyl groups, oxygen atoms or alkyl groups; a hetero-cycloalkylene group, either unsubstituted or substituted with 1 to 4 hydroxyl groups, oxygen atoms or alkyl groups; an alkenylene group having 2 to 4 carbon atoms, either unsubstituted or substituted with 1 to 4 alkyl groups having 1 to 5 carbon atoms; -NHCO-; -CONH-; -CO-; or -SO 2 -; and Q is a hydrogen atom),