<unk> I (R = −CH3)Allethrin II (R = −COOCH3) The<unk>  are a group of related synthetic compounds used in insecticides. They are classified as pyrethroids, i.e. synthetic versions of pyrethrin, a chemical with insecticidal properties found naturally in Chrysanthemum flowers. They were first synthesized in the United States by Milton S. Schechter in 1949.<unk> was the first pyrethroid. They are commonly used in ultra-low volume sprays for outdoor mosquito control, and in many household insecticides such as RAID, as well as mosquito coils.
Allethrins
Leukotriene
Endrin
Prallethrin
Antileukotriene
Endothelin
Pentostatin
Endothelium-derived relaxing factor