lufenuron lufenuron lufenuron is the active ingredient in the veterinary flea control medication program, and one of the two active ingredients in the flea, heartworm, ringworm and anthelmintic medicine milbemycin oxime/lufenuron (sentinel). lufenuron names iupac name 1--3-(2,6-difluorobenzoyl)urea other names n-amino]carbonyl]-2,6-difluorobenzamidefluphenacuru.s. epa pc code: 118205 identifiers cas number 103055-07-8 n 3d model (jsmol) interactive image chebi chebi:39384 y chembl chembl1364906 n chemspider 64813 y echa infocard 100.101.025 kegg d08150 n pubchem cid 71777 unii 1r754m4918 y comptox dashboard (epa) dtxsid5034357 inchi inchi=1s/c17h8cl2f8n2o3/c18-6-5-11(32-17(26,27)14(22)16(23,24)25)7(19)4-10(6)28-15(31)29-13(30)12-8(20)2-1-3-9(12)21/h1-5,14h,(h2,28,29,30,31) ykey: pwpjguxagupahp-uhfffaoysa-n yinchi=1/c17h8cl2f8n2o3/c18-6-5-11(32-17(26,27)14(22)16(23,24)25)7(19)4-10(6)28-15(31)29-13(30)12-8(20)2-1-3-9(12)21/h1-5,14h,(h2,28,29,30,31)key: pwpjguxagupahp-uhfffaoyaq smiles clc1cc(c(cl)cc1oc(f)(f)c(f)c(f)(f)f)nc(=o)nc(=o)c2c(f)cccc2f properties chemical formula c17h8cl2f8n2o3 molar mass 511.15 g·mol−1 melting point 174 °c (345 °f; 447 k) pharmacology atcvet code qp53bc01 (who) except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references lufenuron is stored in the animal's body fat and transferred to adult fleas through the host's blood when they feed. adult fleas transfer it to their growing eggs through their blood, and to hatched larvae feeding on their excrement. it does not kill adult fleas. lufenuron, a benzoylurea pesticide, inhibits the production of chitin in insects. without chitin, a larval flea will never develop a hard outer shell (exoskeleton). with its inner organs exposed to air, the insect dies from dehydration soon after hatching or molting (shedding its old, smaller shell). lufenuron is also used to fight fungal infections, since fungus cell walls are about one third chitin. lufenuron is also sold as an agricultural pesticide for use against lepidopterans, eriophyid mites, and western flower thrips. it is an effective antifungal in plants.