[{"from": "human", "value": "Provide a description of this molecule. [C][C][=C][Branch1][#Branch2][C][=Branch1][=Branch1][=C][C][=C][Ring1][=Branch1][C][O][C][C][Branch1][C][C][N]"}, {"from": "gpt", "value": "The molecule is an oral antiarrhythmic agent that is used for suppression of ventricular arrhythmias. Long term mexiletine therapy is associated with a low rate of serum enzyme elevations and is a rare cause of clinically apparent acute liver injury."}]