Synonyms: Morphinan-6-one,4,5-epoxy-3,14-dihydroxy-17-methyl-, hydrochloride, (5a)- (9CI); Morphinan-6-one, 4,5a-epoxy-3,14-dihydroxy-17-methyl-,hydrochloride (8CI); Morphinone, dihydro-14-hydroxy-, hydrochloride (7CI);14-Hydroxydihydromorphinone hydrochloride;Numorphan;Numorphan hydrochloride;Opana;Opana ER;Oxymorphinone hydrochloride;Oxymorphone hydrochloride;Oxymorphone hydrochloride ER