[{"from": "human", "value": "Provide a description of this molecule. [C][C][C][C@][Branch2][Ring2][Branch1][C@H1][C][C][=C][Branch2][Ring1][Branch1][C@][Ring1][=Branch1][Branch1][Ring2][C][Ring1][#Branch2][C][C][N][Ring1][=Branch2][C][C][C][C][C][Ring1][Ring2][C][=C][Branch1][Branch1][C][=C][Ring1][S][O][O]"}, {"from": "gpt", "value": "The molecule is levorphanol in which a hydrogen at position 14 of the morphinan skeleton is substituted by hydroxy and one of the hydrogens of the N-methyl group is substituted by cyclopropyl. A semi-synthetic opioid agonist-antagonist analgesic, it is used as its (S,S)-tartaric acid salt for relief or moderate to severe pain. It has a role as an opioid analgesic, a mu-opioid receptor agonist, a kappa-opioid receptor agonist and an antitussive."}]