(2,2'-Bimorphinan)-3,3',14,14'-tetrol, 17,17'-bis(cyclopropylmethyl)-4,5:4',5'-diepoxy-6,6'-bis(methylene)-, (5alpha)-(5'alpha)- 176220-84-1 2,2'-Bis(6-deoxo-6-methylenenaltrexone) 2,2'-Bisnalmefene