[{"from": "human", "value": "Describe this molecule. [C][C][C][=Branch1][C][=O][O][C@][Branch1][#Branch2][C][C][=C][C][=C][C][=C][Ring1][=Branch1][Branch1][=Branch2][C][=C][C][=C][C][=C][Ring1][=Branch1][C@H1][Branch1][C][C][C][N][Branch1][C][C][C].[C][=C][C][=C][C][=C][Branch1][=Branch2][C][=C][C][Ring1][=Branch1][=C][Ring1][#Branch2][S][=Branch1][C][=O][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a synthetic diphenyl propionate derivative structurally related to methadone, Propoxyphene Napsylate acts as a central narcotic and analgesic agent by interaction with mu opioid receptors, but with less selectivity then morphine. The dextro-isomer has analgesic effect, while the levo-isomer exerts an antitussive effect. The napsylate salt allows better dosage formulation than the hydrochloride salt. (NCI04)"}]