An alkenyl phosphate that is the 4-(methylamino)-4-oxobut-2-en-2-yl ester of dimethyl phosphate. ChEBI: Monocrotophos is an alkenyl phosphate that is the 4-(methylamino)-4-oxobut-2-en-2-yl ester of dimethyl phosphate. It has a role as an EC 3.1.1.7 (acetylcholinesterase) inhibitor, an EC 3.1.1.8 (cholinesterase) inhibitor, an acaricide, an agrochemical, an avicide and an EC 1.4.3.4 (monoamine oxidase) inhibitor. It is a dialkyl phosphate, an organophosphate insecticide, an alkenyl phosphate and a monocarboxylic acid amide.