[{"from": "human", "value": "Provide a description of this molecule. [C][C][Branch2][Ring1][=Branch1][C][=C][C][=Branch1][S][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][=C][C][=C][C][=C][Ring1][=Branch1][F][C][=Branch1][C][=O][O][C][Branch1][C][C][O][C][=Branch1][C][=O][C]"}, {"from": "gpt", "value": "The molecule is under investigation in clinical trial NCT02043366 (Effect of Butorphanol Combined With Flurbiprofen Axetil on Preventing Hyperalgesia Induced by Remifentanil in Patients)."}]