Bifenthrin is a type of pyrethroid insecticide. Namely, it is a chiral compound that comes in different enantiomers that have different effects. Bifenthrin has two major enantiomers, 1S-cis-bifenthrin and 1R-cis-bifenthrin. 1S-Bifenthrin is 3-4 times as toxic to humans, while 1R-Bifenthrin is over 300 times more effective as a pesticide.
