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Methyl parathion S-isomer , its cas register number is 3820-53-9. It also can be called Phosphorothioic acid, O,O-dimethyl S-(p-nitrophenyl) ester ; O,O-Dimethyl-S-p-nitrofenyl ester kyseliny thiofosforecne ; Dimethyl paranitrophenyl thionophosphate ; and O,O-Dimethyl S-(4-nitrophenyl)thiophosphate .
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