[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][N][C][C][C][C][C][Ring1][=Branch1][C][C][C][=C][C][=C][C][=C][Ring1][=Branch1][N][C][=Branch1][C][=O][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][O][C].[Cl]"}, {"from": "gpt", "value": "The molecule is the hydrochloride salt of encainide. A class Ic antiarrhythmic, it was used for the treatment of severe or life-threatening ventricular arrhythmias, but it was associated with increased death rates in patients who had asymptomatic heart rhythm abnormalities after a recent heart attack and was withdrawn from the market. It has a role as an anti-arrhythmia drug. It contains an encainide."}]