1H-Inden-1-one,2,3-dihydro-5-methyl- , with CAS number of 4593-38-8, can be called 1H-inden-1-one, 2,3-dihydro-5-methyl- ; 5-Methylindan-1-one ; 4593-38-8 [RN] ; 5-Methyl-1-Indanone .It is a white to light yellow crystal powder.