ketorfanol ketorfanol ketorfanol (inn, usan) (developmental code name sbw-22), or ketorphanol, is an opioid analgesic of the morphinan family that was found to possess "potent antiwrithing activity" in animal assays but was never marketed. it is a 17-cycloalkylmethyl derivative of morphinan and as such, is closely related structurally to butorphanol, cyclorphan, oxilorphan, proxorphan, and xorphanol, which act preferentially as κ-opioid receptor agonists and to a lesser extent as μ-opioid receptor partial agonists/antagonists. ketorfanolclinical dataatc codenoneidentifiers iupac name 17-(cyclopropylmethyl)-4-hydroxymorphinan-6-one cas number79798-39-3pubchem cid5490677chemspider16736742unii8z0zxe70xlchemical and physical dataformulac20h25no2molar mass311.425 g·mol−13d model (jsmol)interactive image smiles c1cc1cn2ccc34cc(=o)ccc3c2cc5=c4c(=cc=c5)o inchi inchi=1s/c20h25no2/c22-15-6-7-16-17-10-14-2-1-3-18(23)19(14)20(16,11-15)8-9-21(17)12-13-4-5-13/h1-3,13,16-17,23h,4-12h2/t16-,17+,20-/m0/s1key:ormbbvgvpwuemq-qklqhjqfsa-n