[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][Branch1][C][C][Branch1][C][C][C][Branch1][C][C][Branch2][Branch1][Ring2][C@H1][C][C@@][C][C][C][Ring1][=Branch1][Branch2][Ring2][#Branch1][C@H1][C@@][Ring1][=Branch1][C][C][N][Branch2][Ring1][#Branch1][C@@H1][Ring1][#Branch2][C][C][=C][Ring1][Branch2][C][=Branch1][=Branch2][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][O][O][Ring1][#C][C][C][C][C][Ring1][Ring1][O][C][O].[Cl]"}, {"from": "gpt", "value": "The molecule is the hydrochloride salt form of buprenorphine, a synthetic phenanthrene with narcotic analgesic activity. Buprenorphine hydrochloride is a partial agonist at the mu-opioid receptor and an antagonist at the kapa-opioid receptor in the central nervous system. However, under the conditions of recommended use it behaves as a classic mu-opioid agonist, mimicking the actions of endogenous peptides at CNS opioid receptors. The agonist action results in a raised pain threshold and increased tolerance to pain.  However, it also causes sedation, physical dependence, and respiratory depressant effects and decreases heart rate and blood pressure."}]