[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a quaternary ammonium ion that is nitrogen substituted by three methyl groups and a 2-oxoethyl group. It is an intermediate in the metabolism of amino acids like glycine, serine and threonine. It has a role as an Escherichia coli metabolite, a plant metabolite, an Aspergillus metabolite, a mouse metabolite and a human metabolite."}, {"from": "gpt", "value": "[C][N+1][Branch1][C][C][Branch1][C][C][C][C][=O]"}]