2-Methyl-1,3-indandione ,its CAS NO. is 876-83-5,the synonyms is 2-1,3-Methyl-indandion ; 1H-Indene-1,3(2H)-dione, 2-methyl- (9CI) ; 1,3-Indandione, 2-methyl- ; 2-methyl-1H-indene-1,3(2H)-dione .