Ethion is an organic thiophosphate that is S,S'-methanediyl bis[dihydrogen (phosphorodithioate)] in which all the hydroxy groups have been converted to their corresponding ethyl esters respectively. Ethion is an organophosphate insecticide with inhibitory activity towards the enzyme acetylcholinesterase ( EC 3.1.1.7). It has a role as an EC 3.1.1.7 (acetylcholinesterase) inhibitor, an acaricide, an agrochemical, an insecticide and an environmental contaminant.