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[i]VX - a.k.a O-ethyl S-(2-iisopropylaminoethyl) methylphosphonothioate, chemical formula CH3CH20-P(O)(CH3)-SCH2CH2N(C3H7)2 - is a synthetic organophosphonate neurotoxin which inhibits the action of acetylcholinesterase by binding itself to the enzyme thr