3761-41-9 BRN 2136026 FENTHION SULFOXIDE Fensulfoxide Mesulfenos O,O-Dimethyl O-((4-methylthio)-m-tolyl)phosphorothioate sulfoxide O,O-Dimethyl O-(4-(methylsulfinyl)-m-tolyl) phosphorothioate Phosphorothioic acid, O,O-dimethyl O-(3-methyl-4-(methylsulfinyl)phenyl) ester (9CI) Phosphorothioic acid, O,O-dimethyl O-(4-(methylsulfinyl)-m-tolyl) ester