Patent ID: 8053453

Claim:
A pyrazolone compound represented by formula (2): wherein R 1 is a C 2-14 aryl group, wherein the C 2-14 aryl group may be optionally substituted with one or more C 1-6 alkyl groups, one or more C 1-3 alkyl groups substituted with one or more fluorine atoms, one or more halogen atoms, one or more nitro groups, one or more C 1-6 alkylcarbonyl groups, one or more hydroxyl groups or one or more amino groups, and wherein the hydroxyl group and the amino group may be substituted with a C 1-6 alkyl group or a C 1-6 alkylcarbonyl group; R 2 is a hydrogen atom, a C 1-6 alkyl group, a C 1-3 alkyl group substituted with one or more fluorine atoms or a C 2-14 aryl group; R 3 is a hydrogen atom, a C 1-6 alkyl group or a C 1-3 alkyl group substituted with one or more fluorine atoms, and R 4 is a C 2-14 aryl group substituted with NR 5 R 6 (wherein R 5 and R 6 are independently hydrogen atoms, formyl groups, C 1-6 alkyl groups or C 1-6 alkylcarbonyl groups), a tautomer, prodrug or pharmaceutically acceptable salt of the compound.