[{"from": "human", "value": "What can you tell me about this molecule? [C][N][C][=N][C][=Branch2][Ring1][C][=C][Ring1][Branch1][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH1+1][Branch1][C][C][C][S]"}, {"from": "gpt", "value": "The molecule is an L-alpha-amino acid zwitterion formed from ovothiol C by transfer of a proton from the carboxy to the amino group; major species at pH 7.3. It is functionally related to a L-histidine zwitterion. It is a tautomer of an ovothiol C."}]