Patent ID: 7256199

Claim:
A pyrimidone compound represented by formula (I) or a pharmaceutically acceptable salt thereof: wherein R 1 represents a group represented by —N(R 4 )—W—R 5 wherein R 4 represents a hydrogen atom; R 5 represents a C 1 –C 18 alkyl group which may be substituted, a C 3 –C 18 alkenyl group which may be substituted, a C 3 –C 18 alkynyl group which may be substituted, a C 3 –C 8 cycloalkyl group which may be substituted, or a C 6 –C 14 aryl group which may be substituted, and symbol “W” represents a single bond, a carbonyl group, a sulfonyl group, NH or a nitrogen atom substituted with a C 1 –C 18 alkyl group which may be substituted; R 2 represents a hydrogen atom; and R 3 represents a 4-pyridyl group which may be substituted.