[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][O][C][=Branch1][C][=O][C][Branch1][O][C][C][N][Branch1][Branch1][C][C][Ring1][=Branch1][C][C][=C][C][=C][C][=C][Ring1][=Branch1]"}, {"from": "gpt", "value": "The molecule is a synthetic opioid which has been used widely for therapy of moderate-to-severe pain. Meperidine has not been linked to serum enzyme elevations during therapy or to clinically apparent liver injury."}]