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