zeta-cypermethrin
zeta-cypermethrin
A diastereoisomeric mixture comprising the isomeric pair (1<i>R</i>)-<i>cis</i>-(α<i>S</i>)- and (1<i>S</i>)-<i>trans</i>-(α<i>R</i>)-cypermethrin together with the isomeric pair (1<i>S</i>)-<i>cis</i>-(α<i>S</i>)- and (1<i>S</i>)-<i>trans</i>-(α<i>S</i>)-cypermethrin where the ratio between the isomeric pairs lies in the range 45:55 to 55:45.