CAS NO: 67-71-0 Methyl sulfone ,Dimethyl sulfone,MSM,Methyl sulfonyl methane,Methylsulfonylmethane,DMSO2 Methyl Sulfonyl Methane( ... , organic, sulfur-containing compound related to another sulfur-containing substance, dimethyl sulfoxide (DMSO). MSM is found in small amounts throughout nature ...