Nalfurafine Impurity 1

Chemical Name: (4R,4aS,7S,7aR,12bS)-7-(Benzyl(methyl)amino)-3-(cyclopropylmethyl)-1,2,3,4,5,6,7,7a-octahydro-4aH-4,12-methanobenzofuro[3,2-e]isoquinoline-4a,9-diol

Smile: O[C@@]12CC[C@H](N(CC3=CC=CC=C3)C)[C@@]4([H])[C@@]15CCN(CC6CC6)[C@]2([H])CC7=C5C(O4)=C(O)C=C7