Patent ID: 7709519

Claim:
A propane-1,3-dione derivative represented by the formula (I) or a pharmaceutically acceptable salt thereof symbols in the formula mean as follows, ring A: benzene which may be substituted with 1 to 3 substituent groups, wherein the substituent group is halogen, CN, lower alkyl which may be substituted with halogen, —O-lower alkyl, —CO—O— lower alkyl or amino, R 401 and R 402 : may be the same or different from each other and each is H, halogen, OH, —O-lower alkyl, or lower alkyl, R 101 , R 102 , R 103 and R 104 : may be the same or different from one another and each is H, halogen, OH, or —O-lower alkyl which may be substituted with aryl or heteroaryl.