Patent ID: 7160892

Claim:
A compound represented by the following formula (I), a salt thereof or a solvate thereof: wherein in the formula, R 1 and R 2 are the same as or different from each other and each represents a hydrogen atom, an alkyl group having one to six carbon atoms which may be substituted, an alkenyl group having two to six carbon atoms which may be substituted, an alkynyl group having two to six carbon atoms which may be substituted, a cycloalkyl group having three to eight carbon atoms which may be substituted, a cycloalkenyl group having three to eight carbon atoms which may be substituted, a 5 to 14-membered non-aromatic heterocyclic group which may be substituted, an aromatic cyclic hydrocarbon group having six to fourteen carbon atoms which may be substituted, a 5 to 14-membered aromatic heterocyclic group which may be substituted, an acyl group having one to six carbon atoms which may be substituted or an alkylsulfonyl group having one to six carbon atoms which may be substituted; R 3 represents a hydrogen atom, an alkyl group having one to six carbon atoms which may be substituted, an alkenyl group having two to six carbon atoms which may be substituted or an alkynyl group having two to six carbon atoms which may be substituted; R 4 represents a pyridyl which may be substituted or a pyridone group which may be substituted; and R 5 represents an aromatic cyclic hydrocarbon group having six to fourteen carbon atoms which may be substituted or a 5 to 14-membered aromatic heterocyclic group which may be substituted.