[{"from": "human", "value": "Describe this molecule. [C][Branch1][#Branch2][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1][S][S][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is a cystine zwitterion. It is an enantiomer of a D-cystine zwitterion. It is a tautomer of a L-cystine."}]