[{"from": "human", "value": "Describe this molecule. [C][C][C][N][C][Branch1][Ring2][C][Ring1][=Branch1][C][N][C][=Branch1][C][=O][C][=C][Branch2][Ring1][Ring1][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][O][C][C][Branch1][C][F][Branch1][C][F][F][O][C][C][Branch1][C][F][Branch1][C][F][F]"}, {"from": "gpt", "value": "The molecule is an oral antiarrhythmic agent that has been in use for several decades. Long term flecainide therapy is associated with a low rate of serum enzyme elevations and is a very rare cause of clinically apparent acute liver injury."}]