[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a methylhistidine in which the methyl group is located at N-3. It has a role as a human metabolite. It is a non-proteinogenic alpha-amino acid and a methylhistidine. It is a tautomer of a 3-methylhistidine zwitterion."}, {"from": "gpt", "value": "[C][N][C][=N][C][=C][Ring1][Branch1][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}]