21988-66-9 BRN 3065312 Phosphoramidic acid, (N-(O',O'-dimethylphosphorothio)ethyl-N-ethyl)-, O,O'-diisopropyl ester Phosphorothioic acid, O,O-dimethyl S-(O',O'-diisopropyl-N-ethylphosphoramido)ethyl ester