ChEBI: Diethyl 2-[(dimethoxyphosphorothioyl)thio]succinate is a diester that is diethyl succinate in which position 2 is substituted by a (dimethoxyphosphorothioyl)thio group. It is a diester, an ethyl ester and an organic thiophosphate.NCI Thesaurus (NCIt): Malathion is a synthetic phosphorous compound and cholinesterase inhibitor that is strictly used as a topical pediculicide. Malathion exerts its action on the nervous system of the lice by irreversibly inhibiting the activity of cholinesterase, thereby allowing acetylcholine to accumulate at cholinergic synapses and enhancing cholinergic receptor stimulation. This eventually leads to the head lice's death.