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(4R,4aR,7R,7aR,12bS,14S)-14-Acetyl-9-(benzyloxy)-7-methoxy-1,2,7,7a-tetrahydro-7,4a-ethano-4,12-methanobenzofuro[3,2-e]isoquinoline-3(4H)-carbonitrile(Buprenorphine Impurity) | Gentaur