Alldrin (Chloropyriphos 20%EC) is a liquid insecticide that contains 20% chlorpyriphos, a broad-spectrum organophosphate insecticide. It is used to control a wide range of insect pests in agriculture, horticulture, and forestry.

Chlorpyriphos 20% E.C is an organophosphate insecticide that inhibits the activity of the enzyme acetylcholinesterase, which is responsible for breaking down the neurotransmitter acetylcholine in the nervous system of insects.