[{"from": "human", "value": "Provide a description of this molecule. [C][NH2+1][C@@H1][Branch1][=Branch2][C][C][=C][N][=C][N][Ring1][Branch1][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is an amino acid zwitterion obtained by transfer of a proton from the carboxy to the amino group of N(alpha)-methyl-L-histidine. It is a tautomer of a N(alpha)-methyl-L-histidine."}]