ethylketazocine ethylketazocine ethylketazocine (win-35,197-2), is an opioid drug of the benzomorphan family which has been used extensively in scientific research in the last few decades as a tool to aid in the study of the κ-opioid receptor. however, due to its relatively poor selectivity for the κ-opioid receptor over the μ- and δ-opioid receptors (of which it has approximately 80% and 20% of the affinity for, respectively, in comparison), as well as its relatively poor intrinsic activity at all sites (i.e., acts as a partial agonist with mixed agonist and antagonist properties), it has been mostly replaced in recent times by newer and more potent and selective compounds like u-50,488 and ici-199,441. ethylketazocineclinical dataother namesethylketocyclazocineatc codenoneidentifiers iupac name (1s,9r)-10-(cyclopropylmethyl)-1-ethyl-4-hydroxy-13-methyl-10-azatricyclotrideca-2,4,6-trien-8-one cas number36292-66-7pubchem cid644273iuphar/bps1602chemspider559289chemblchemblchembl279968comptox dashboard (epa)dtxsid40957665 chemical and physical dataformulac19h25no2molar mass299.407 g·mol−13d model (jsmol)interactive image smiles o=c2c1c(cc(o)cc1)3(c(2n(cc3)cc4cc4)c)cc inchi inchi=1s/c19h25no2/c1-3-19-8-9-20(11-13-4-5-13)17(12(19)2)18(22)15-7-6-14(21)10-16(15)19/h6-7,10,12-13,17,21h,3-5,8-9,11h2,1-2h3/t12?,17-,19+/m1/s1key:sejuqqopvauetf-mkfrlifgsa-n