Levophenacylmorphan2-(1,3,4,9,10,10a-Hexahydro-6-hydroxy-2H-10,4a-iminoethanophenanthren-11-yl)acetophenoneLevophenacylmorphinan-3-olNIH 752517-Phenacylmorphinan-3-ol(-)-3-Hydroxy-N-phenacylmorphinan17-(2-Oxo-2-phenylethyl)morphinan-3-olBenzorphanolRo 4-0288/1