Synonyms: Etorphine hydrochloride;(6R,7R,14R)-7,8-Dihydro-7-((1R)-1-hydroxy-1-methylbutyl)-6-O-methyl-6,14alpha-ethenomorphine hydrochloride;19-Propylorvinol hydrochloride;6,14-Endoetheno-7-(2-hydroxy-2-pentyl)-tetrahydro-oripavine hydrochloride;7-alpha-(1-(R)-Hydroxy-1-methylbutyl)-6,14-endoethenotetrahydro-oripavine hydrochloride;Etorphine HCl;M 99;M 99 reckitt;M-99;Propylorvinol hydrochloride;UNII-8CBE01N748;(5alpha,7alpha(R))-4,5-Epoxy-3-hydroxy-6-methoxy-alpha,17-dimethyl-alpha-propyl-6,14-ethenomorphinan-7-methanol hydrochloride;6,14-endo-Ethenotetrahydrooripavine, 7-alpha-(1-(R)-hydroxy-1-methylbutyl)-, hydrochloride;DEA No. 9059