[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is the hydrochloride salt form of propafenone with class 1C antiarrhythmic effects. Propafenone hydrochloride stabilizes the neuronal membrane by binding to and inhibiting voltage-gated sodium channels, thereby reducing sodium influx required for the initiation and conduction of impulses in Purkinje and myocardial cells. This agent produces a marked depression of phase 0 and prolonged effective refractory period in the atrio-ventricular nodal and His-Purkinje tissue, resulting in a profound decrease in excitability, conduction velocity and automaticity, thereby counteracting atrial and ventricular arrythmias."}, {"from": "gpt", "value": "[C][C][C][N][C][C][Branch2][Ring1][=Branch2][C][O][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=Branch1][C][=O][C][C][C][=C][C][=C][C][=C][Ring1][=Branch1][O].[Cl]"}]