[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][Branch1][#C][C][S][S][C][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1][C][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is dizwitterionic form of homocystine arising from transfer of two protons from the carboxy to the amino groups; major species at pH 7.3. It has a role as a human metabolite. It is a tautomer of a homocystine."}]