etazocine etazocine etazocine (nih-7856) is an opioid analgesic of the benzomorphan family which was never marketed. it acts as a partial agonist of the opioid receptors, with mixed agonist and antagonist effects. in animal studies, it was shown to induce analgesia, dependency, and respiratory depression, with overall effects similar to those of morphine, but with substantially reduced potency in comparison. etazocineclinical dataother namesnih-7856 ((±)-form);gpa-208 ((−)-form);gpa-2087 ((−)-form);nih-8178 ((−)-form);fda-0487 ((−)-form)atc codenonelegal statuslegal status in general: non-regulated identifiers iupac name 1,2,3,4,5,6-hexahydro-6,11-diethyl-3-methyl-2,6-methano-3-benzazocin-8-olor5,7-diethyl-2-hydroxy-2-methyl-6,7-benzomorphan cas number0135188ab y 10286-45-0 ((−)-form (hcl))pubchem cid187767chemspider163214unii25z262vu9echemical and physical dataformulac17h25nomolar mass259.393 g·mol−13d model (jsmol)interactive image smiles oc1ccc3c(c1)2(((n(cc2)c)c3)cc)cc inchi inchi=1s/c17h25no/c1-4-14-16-10-12-6-7-13(19)11-15(12)17(14,5-2)8-9-18(16)3/h6-7,11,14,16,19h,4-5,8-10h2,1-3h3/t14-,16-,17-/m0/s1key:jyrbqcwxznderm-xirddkmysa-n