flumethrin flumethrin flumethrin is a pyrethroid insecticide. it is used externally in veterinary medicine against parasitic insects and ticks on cattle, sheep, goats, horses, and dogs, and the treatment of parasitic mites in honeybee colonies. flumethrin names iupac name cyano(4-fluoro-3-phenoxyphenyl)methyl 3--2,2-dimethylcyclopropanecarboxylate identifiers cas number 69770-45-2 y 3d model (jsmol) interactive image chembl chembl2107248 chemspider 82804 echa infocard 100.067.352 pubchem cid 91702 unii 2o051w13lh y comptox dashboard (epa) dtxsid8058166 inchi inchi=1s/c28h22cl2fno3/c1-28(2)21(15-22(30)17-8-11-19(29)12-9-17)26(28)27(33)35-25(16-32)18-10-13-23(31)24(14-18)34-20-6-4-3-5-7-20/h3-15,21,25-26h,1-2h3key: yxwcbrdrvxhabn-uhfffaoysa-ninchi=1/c28h22cl2fno3/c1-28(2)21(15-22(30)17-8-11-19(29)12-9-17)26(28)27(33)35-25(16-32)18-10-13-23(31)24(14-18)34-20-6-4-3-5-7-20/h3-15,21,25-26h,1-2h3key: yxwcbrdrvxhabn-uhfffaoyaz smiles clc(=cc3c(c(=o)oc(c#n)c2ccc(f)c(oc1ccccc1)c2)c3(c)c)c4ccc(cl)cc4 properties chemical formula c28h22cl2fno3 molar mass 510.39 g·mol−1 pharmacology atcvet code qp53ac05 (who) except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references chemistry flumethrin is a complex mixture of stereoisomers. the molecule contains three asymmetric carbon atoms, there is cis-trans isomerism at the cyclopropane ring, and cis-trans isomerism at the carbon-carbon double bond of the alkene. so there are 16 different isomers. commercial flumethrin typically contains 92% of the trans isomers on the cyclopropane ring and the cis-configuration at the olefinic carbon-carbon double bond and 8% of the isomer with cis geometry on the cyclopropane ring and the cis-configuration at the olefinic carbon-carbon double bond. uses flumethrin is used in products, such as flea and tick collars, to protect pets against fleas. it is also used in the proprietary product, ″bayvarol″, ″polyvar yellow″ which are veterinary treatments used by beekeepers against the parasitic mite varroa destructor.