[{"from": "human", "value": "Describe this molecule. [C][=C][C][=Branch1][S][=C][C][=C][Ring1][=Branch1][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1][O]"}, {"from": "gpt", "value": "The molecule is an amino acid zwitterion arising from transfer of a proton from the carboxy to the amino group of L-tyrosine; major species at pH 7.3. It is a conjugate base of a L-tyrosinium. It is a conjugate acid of a L-tyrosinate(1-). It is a tautomer of a L-tyrosine."}]