Nalmefene N-Oxide 

Chemical Name: (3S,4R,4aS,7aS,12bS)-3-(cyclopropylmethyl)-4a,9-dihydroxy-7-methylene-2,3,4,4a,5,6,7,7a-octahydro-1H-4,12-methanobenzofuro[3,2-e]isoquinoline 3-oxide

Smile: OC1=C(O2)C([C@]([C@]2([H])C(CC3)=C)(CC[N@+]4([O-])CC5CC5)[C@]3(O)[C@@]4([H])C6)=C6C=C1