beta-cypermethrin
beta-cypermethrin
"A diastereoisomeric mixture comprising the enantiomeric pair (1R)-cis-(alphaS)- and (1S)-cis-(alphaR)-cypermethrin in ratio approximately 2:3 with the enantiomeric pair (1S)-trans-(alphaR)- and (1R)-trans-(alphaS)-cypermethrin."