[{"from": "human", "value": "Could you provide a description of this molecule? [C][Branch1][Ring1][C][S][C][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is an amino acid zwitterion of homocysteine arising from transfer of a proton from the carboxy to the amino group; major species at pH 7.3. It has a role as a human metabolite, an Escherichia coli metabolite and a Saccharomyces cerevisiae metabolite. It is a tautomer of a homocysteine."}]