Allethrins
![Allethrin I (R = −CH3)Allethrin II (R = −COOCH3)](/Images/godic/202412/18/Allethrin_2D.svg1749.png")
The allethrins are a group of related synthetic compounds used in insecticides. They are synthetic pyrethroids, a synthetic form of a chemical found naturally in the chrysanthemum flower. They were first synthesized in the United States by Milton S. Schechter in 1949. Allethrin was the first pyrethroid.