[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a quaternary ammonium ion with three octyl groups and one methyl group attached to the nitrogen."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][N+1][Branch1][C][C][Branch1][=Branch2][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C]"}]