[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][=C][C][N][C][C][C@][C@@H1][C@H1][Ring1][=Branch1][C][C][=C][Ring1][=Branch1][C][=Branch1][=Branch2][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][O][O][C@H1][Ring1][=N][C@H1][Branch1][Branch1][C][=C][Ring1][#C][O]"}, {"from": "gpt", "value": "The molecule is a mixed opioid agonist\u2013antagonist. It acts at two opioid receptors\u2014at the mu receptor it has antagonistic effects, and at the kappa receptors it exerts high-efficacy agonistic characteristics. It is used to reverse opioid overdose and (starting in the 1950s) in a challenge test to determine opioid dependence."}]