[{"from": "human", "value": "Provide a brief overview of this molecule. [C][Branch1][S][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][N][C][=Branch1][C][=O][C][NH3+1][C][=Branch1][C][=O][N]"}, {"from": "gpt", "value": "The molecule is a peptide zwitterion obtained by transfer of a proton from the carboxy to the amino terminus of Gly-Asn. It is a tautomer of a Gly-Asn."}]