Synonyms: Morphinan-3,6,14-triol,17-(cyclobutylmethyl)-4,5-epoxy-, hydrochloride, (5a,6a)- (9CI); Morphinan-3,6a,14-triol, 17-(cyclobutylmethyl)-4,5a-epoxy-, hydrochloride (8CI);17-(Cyclobutylmethyl)-4,5a-epoxymorphinan-3,6a,14-triol hydrochloride; EN 2234A; MCV 4385;N-Cyclobutylmethyl-7,8-dihydro-14-hydroxynormorphine hydrochloride; NIH 10274;Nalbuphine hydrochloride; Nalufin; Nubain; UM 686