Patent ID: 7829585

Claim:
A compound represented by the following formula (I), or a salt thereof: wherein X represents an oxygen atom, R 1 represents a hydrogen atom, a halogen atom, a cyano group, an amino group or a group selected from substituent group a; and R 2 and R 3 independently represent a hydrogen atom, a halogen atom, a hydroxyl group or a group selected from substituent group c, except for a case in which R 2 and R 3 are both hydrogen atoms: substituent group a: a C 1-6 alkyl group, a C 2-6 alkenyl group, a C 2-6 alkynyl group, a C 3-8 cycloalkyl group, a C 3-8 cycloalkyl C 1-6 alkyl group, a C 1-6 alkoxy group, a C 2-6 alkenyloxy group, a C 2-6 alkynyloxy group, a C 3-8 cycloalkoxy group, a C 3-8 cycloalkyl C 1-6 alkoxy group, a C 1-6 alkylthio group, a C 3-8 cycloalkyl C 1-6 alkylthio group, a mono-C 1-6 alkylamino group, a mono-C 2-6 alkenylamino group, a mono-C 2-6 alkynylamino group, a mono-C 3-8 cycloalkylamino group, a mono-C 3-8 cycloalkyl C 1-6 alkylamino group, a di-C 1-6 alkylamino group, a C 1-6 alkylcarbonyl group and a C 1-6 alkoxy C 1-6 alkyl group, and each group described in substituent group a may have 1 to 3 groups selected from the following substituent group b: substituent group b: a halogen atom, a hydroxyl group, a mercapto group, a cyano group, a C 1-6 alkyl group, a C 6-10 aryl group, a C 1-6 alkoxy group and an aminosulfonyl group, substituent group c: a C 1-6 alkyl group, a C 2-6 alkenyl group, a C 2-6 alkynyl group, a C 3-8 cycloalkyl C 1-6 alkyl group, a C 6-10 aryl C 1-6 alkyl group, a C 1-6 alkoxy group, a C 2-6 alkenyloxy group, a C 2-6 alkynyloxy group, a C 5-10 aryloxy group, a C 3-8 cycloalkyl C 1-6 alkoxy group, a C 6-10 aryl C 1-6 alkoxy group, a C 6-10 aryloxy C 1-6 alkoxy group, a C 1-6 alkoxy C 1-6 alkoxy group, a mono-C 6-10 arylamino group, a mono-C 6-10 aryl C 1-6 alkylamino group, a C 6-10 aryloxy C 1-6 alkyl group, and a C 1-6 alkoxy C 1-6 alkyl group, and each group described in substituent group c may have 1 to 3 groups selected from the group consisting of a halogen atom, a C 1-6 alkyl group and a C 1-6 alkoxy group.