597-89-7 8061 HC Isomethylparathion O,S-Dimethyl O-(4-nitrophenyl)thiophosphate O,S-Dimethyl O-(p-nitrophenyl) phosphorothioate Phosphorothioic acid, O,S-dimethyl O-(4-nitrophenyl) ester Phosphorothioic acid, O,S-dimethyl O-(p-nitrophenyl) ester S-Methyl-methylparathion