[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a quarternary ammonium cation having one dodecyl and three methyl substituents around the central nitrogen. It has a role as a surfactant. It is a quaternary ammonium salt and a bromide salt. It contains a dodecyltrimethylammonium ion."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][N+1][Branch1][C][C][Branch1][C][C][C].[Br-1]"}]