3820-53-9 4-06-00-01720 (Beilstein Handbook Reference) BRN 1985837 Dimethyl paranitrophenyl thionophosphate Methyl parathion S-isomer O,O-Dimethyl S-(4-nitrophenyl)thiophosphate O,O-Dimethyl S-(p-nitrophenyl) phosphorothioate O,O-Dimethyl-S-p-nitrofenyl ester kyseliny thiofosforecne [Czech] Phosphorothioic acid, O,O-dimethyl S-(p-nitrophenyl) ester