fenvalerate fenvalerate fenvalerate is a synthetic pyrethroid insecticide. it is a mixture of four optical isomers which have different insecticidal activities. the 2-s alpha (or ss) configuration, known as esfenvalerate, is the most insecticidally active isomer. fenvalerate consists of about 23% of this isomer. fenvalerate names iupac name (rs)-alpha-cyano-3-phenoxybenzyl (rs)-2-(4-chlorophenyl)-3-methylbutyrate identifiers cas number 51630-58-1 y 3d model (jsmol) interactive image chebi chebi:5014 y chembl chembl492491 y chemspider 3230 y echa infocard 100.052.098 kegg c10988 y pubchem cid 3347 rtecs number cy 1576350 unii z6mxz39302 y comptox dashboard (epa) dtxsid3020621 inchi inchi=1s/c25h22clno3/c1-17(2)24(18-11-13-20(26)14-12-18)25(28)30-23(16-27)19-7-6-10-22(15-19)29-21-8-4-3-5-9-21/h3-15,17,23-24h,1-2h3 ykey: nypjdwwkzlnggm-uhfffaoysa-n yinchi=1/c25h22clno3/c1-17(2)24(18-11-13-20(26)14-12-18)25(28)30-23(16-27)19-7-6-10-22(15-19)29-21-8-4-3-5-9-21/h3-15,17,23-24h,1-2h3key: nypjdwwkzlnggm-uhfffaoyau smiles clc1ccc(cc1)c(c(=o)oc(c#n)c3cccc(oc2ccccc2)c3)c(c)c properties chemical formula c25h22clno3 molar mass 419.91 g·mol−1 appearance yellow-brown viscous liquid density 1.175 g/cm3 solubility in water 2 μg/l pharmacology atcvet code qp53ac14 (who) qp53ax02 (who) except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). y verify (what is yn ?) infobox references fenvalerate is an insecticide of moderate mammalian toxicity. in laboratory animals, central nervous system toxicity is observed following acute or short-term exposure. fenvalerate has applications against a wide range of pests including some of the more destructive such as the helicoverpa assulta. residue levels are minimized by low application rates. fenvalerate is most toxic to bees and fish. it is found in some emulsifiable concentrates, ulv, wettable powders, slow release formulations, insecticidal fogs, and granules. it is most commonly used to control insects in food, feed, and cotton products, and for the control of flies and ticks in barns and stables. fenvalerate does not affect plants, but is active for an extended period of time. fenvalerate may irritate the skin and eyes on contact, and is also harmful if swallowed.