[{"from": "human", "value": "Describe this molecule. [C][=C][C][=Branch2][Ring1][Ring1][=C][Branch1][#C][C][=C][Ring1][=Branch1][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1][Cl][O]"}, {"from": "gpt", "value": "The molecule is an L-alpha-amino acid zwitterion obtained by transfer of a proton from the carboxy to the amino group of 3-chloro-L-tyrosine; major species at pH 7.3. It is a tautomer of a 3-chloro-L-tyrosine."}]