title: Need for purity both in testing and commercial production of organophosphorus compounds.
mesh_terms: D000818:Animals; D002490:Central Nervous System / Q000187:drug effects*; D002645:Chickens; D002800:Cholinesterase Inhibitors; D004950:Esterases / Q000037:antagonists & inhibitors*; D006801:Humans; D007306:Insecticides / Q000592:standards / Q000633:toxicity*; D009943:Organophosphorus Compounds; D013997:Time Factors
chemical_list: D002800:Cholinesterase Inhibitors; D007306:Insecticides; D009943:Organophosphorus Compounds; D004950:Esterases