2,2’-Bisnalmefene

(5S,5’S,9S,9’S,17S,17’S)-3,3′-bis(cyclopropylmethyl)-8,8′-dimethylene-1,1′,2,2′,3,3′,4,4′,5,5′,6,6′,7,7′,8,8′,9,9′,18,18′-icosahydro-[13,13′-bi(4,12-methanobenzofuro[3,2-e]isoquinoline)]-5,5′,12,12′-tetraol