[{"from": "human", "value": "What can you tell me about this molecule? [C][C][C@@H1][Branch2][Ring1][S][C][Branch1][O][C][C@H1][Branch1][C][C][N][Branch1][C][C][C][Branch1][=Branch2][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=C][C][=C][C][=C][Ring1][=Branch1][O][C][=Branch1][C][=O][C]"}, {"from": "gpt", "value": "The molecule is a narcotic analgesic with a long onset and duration of action. It is used mainly in the treatment of narcotic dependence.   Levacetylmethadol was withdrawn from use in the European Union due to its high risk of QT interval prolongation. The production of levacetylmethadol in the US has ceased as well."}]