[{"from": "human", "value": "Describe this molecule. [C][C][O][C][=Branch1][C][=O][N][C][=C][Branch2][Ring1][=Branch1][N][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][N][C][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][F][N]"}, {"from": "gpt", "value": "The molecule is a pyridine derivative that is in clinical use as a nonopioid analgesic. It was approved for the treatment of pain in 1984 in Europe. It is not approved for use in the U.S. or Canada, but is currently in phase II trials for the treatment of fibromyalgia."}]