17-(CYCLOPROPYLMETHYL)-4,5-EPOXY-14-HYDROXYMORPHINAN-6-ONE CYCLIC 1,2-ETHANEDIYL ACETAL, (5.ALPHA.)-
17-(cyclopropylmethyl)-4,5-epoxy-14-hydroxymorphinan-6-one cyclic 1,2-ethanediyl acetal, (5.alpha.)-