[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a quarternary ammonium bromide salt in which the cation has four propyl substituents around the central nitrogen. It has a role as a potassium channel blocker. It is a bromide salt and a quaternary ammonium salt. It contains a tetrapropylammonium."}, {"from": "gpt", "value": "[C][C][C][N+1][Branch1][Ring2][C][C][C][Branch1][Ring2][C][C][C][C][C][C].[Br-1]"}]