[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a quaternary ammonium ion in which the substituents on nitrogen are methyl (three) and carboxymethyl. It has a role as a fundamental metabolite. It is a conjugate acid of a glycine betaine."}, {"from": "gpt", "value": "[C][N+1][Branch1][C][C][Branch1][C][C][C][C][=Branch1][C][=O][O]"}]