2-Pentanone,4-mercapto-4-methyl- , its CAS NO. is 19872-52-7, the synonyms are 4-Methyl-4-mercapto-pentan-2-one ; 2-Mercapto-2-methylpentan-4-one ; 4-Methyl-4-sulfanylpentan-2-one .5. MSDS 2.Hazard identification 2.1 Classification of the substance or mixture Not classified. 2.2 ...