[{"from": "human", "value": "Describe this molecule. [C][C@H1][C@H1][C][C][=C][Branch2][Ring1][Ring1][C@@][Ring1][=Branch1][Branch1][=N][C][C][N][Ring1][Branch2][C][C][=C][Branch1][C][C][C][C][C][=C][Branch1][Branch1][C][=C][Ring1][S][O]"}, {"from": "gpt", "value": "The molecule is an agonist at the kappa and sigma opioid receptors and has a weak antagonist action at the mu receptor. (From AMA Drug Evaluations Annual, 1991, p97)"}]