[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a quaternary ammonium ion that is the S-acetyl derivative of beta-methylthiocholine"}, {"from": "gpt", "value": "[C][C][Branch1][#Branch2][C][N+1][Branch1][C][C][Branch1][C][C][C][S][C][=Branch1][C][=O][C]"}]