Patent ID: 7427615

Claim:
A pyrimidone compound represented by formula (I) or a salt thereof: wherein R 1 represents a C 1 -C 12 alkyl group which may be substituted; R represents any one of groups represented by the following formulas (II) to (V): wherein R 2 and R 3 independently represent a hydrogen atom or a C 1 -C 8 alkyl group; R 4 represents a benzene ring which may be substituted, a naphthalene ring which may be substituted, an indan ring which may be substituted, a tetrahydronaphthalene ring which may be substituted, or an optionally substituted heterocyclic ring having 1 to 4 hetero atoms selected from the group consisting of oxygen atom, sulfur atom and nitrogen atom, and having 5 to 10 ring-constituting atoms in total; R 5 represents a C 1 -C 8 alkyl group which may be substituted, a C 3 -C 8 cycloalkyl group which may be substituted, a benzene ring which may be substituted, a naphthalene ring which may be substituted, an indan ring which may be substituted, a tetrahydronaphthalene ring which may be substituted, or an optionally substituted heterocyclic ring having 1 to 4 hetero atoms selected from the group consisting of oxygen atom, sulfur atom, and nitrogen atom, and having 5 to 10 ring-constituting atoms in total; R 6 represents a hydrogen atom, a C 1 -C 8 alkyl group which may be substituted, a benzene ring which may be substituted; or R 5 and R 6 may bind to each other to form together with the carbon to which R 5 and R 6 are attached an optionally substituted spiro carbocyclic ring having 3 to 11 ring-constituting atoms in total; R 7 and R 8 independently represent a hydrogen atom or a C 1 -C 8 alkyl group, or R 7 and R 8 may combine to each other to form a C 2 -C 6 alkylene group; R 9 and R 10 represent a C 1 -C 8 alkyl group which may be substituted, a C 3 -C 8 cycloalkyl group which may be substituted, a benzene ring which may be substituted, a naphthalene ring which may be substituted, an optionally substituted heterocyclic ring having 1 to 4 hetero atoms selected from the group consisting of oxygen atom, sulfur atom, and nitrogen atom, and having 5 to 10 ring-constituting atoms in total, or R 9 and R 10 represent —N(R 11 )(R 12 ) wherein R 11 represents a hydrogen atom, a C 1 -C 8 alkyl group; and R 12 represents a C 1 -C 8 alkyl group, a benzene ring which may be substituted, a naphthalene ring which may be substituted, or an optionally substituted heterocyclic ring having 1 to 4 hetero atoms selected from the group consisting of oxygen atom, sulfur atom, and nitrogen atom, and having 5 to 10 ring-constituting atoms in total; and X represents CH 2 , O or NR 13 wherein R 13 represents a hydrogen atom or a C 1 -C 8 alkyl group.