[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][=C][C][=Branch1][O][=C][C][=Branch1][=Branch1][=C][Ring1][=Branch1][O][C][O][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is an amino acid zwitterion resulting from a transfer of a proton from the carboxy to the amino group of 5-hydroxy-3-methyl-O-methyl-L-tyrosine; major species at pH 7.3. It is a tautomer of a 3-hydroxy-O,5-dimethyl-L-tyrosine."}]