[{"from": "human", "value": "Could you provide a description of this molecule? [C][Branch1][O][C][Branch1][Ring1][C][S][C][=Branch1][C][=O][O-1][S]"}, {"from": "gpt", "value": "The molecule is a monocarboxylic acid anion that is the conjugate base of 3-mercapto-2-mercaptomethylpropanoic acid; major species at pH 7.3. It is a conjugate base of a 3-mercapto-2-mercaptomethylpropanoic acid."}]