[{"from": "human", "value": "Could you provide a description of this molecule? [C][=N][C][=Branch1][P][=C][Branch1][Ring2][N][Ring1][Branch1][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1][S][=Branch1][C][=O][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 formed from S-(5-histidyl)cysteine sulfoxide by transfer of protons from the two carboxy to the two amino grousp; major species at pH 7.3. It is functionally related to a L-histidine zwitterion and a L-cysteine zwitterion. It is a tautomer of a S-(5-histidyl)cysteine sulfoxide."}]