[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a quarternary ammonium salt whose basic unit comprises an octyltrimethylammonium cation and a bromide anion. It is a quaternary ammonium salt and a bromide salt. It contains an octyltrimethylammonium ion."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][N+1][Branch1][C][C][Branch1][C][C][C].[Br-1]"}]