(5a)-(5'a)-17,17'-Bis(cyclopropylmethyl)-4,5:4',5'-diepoxy-6,6'-bis(methylene)-[2,2'-bimorphinan]-3,3',14,14'-tetrol;2,2'-Bis(6-deoxo-6-methylenenaltrexone;2,2'-Bisnalmefene;2,2'-Bisnalmefene (Nalmefene Impurity);Nalmefene Impurity;NalMefene related substance;(5α)-(5'α)-17,17'-Bis(cyclopropylMethyl)-4,5:4',5'-diepoxy-6,6'-bis(Methylene)-[2,2'-biMorphinan]-3,3',14,14'-tetrol
