[{"from": "human", "value": "Provide a description of this molecule. [C][S][C][C][C][/C][=Branch1][#Branch1][=C][/C][=Branch1][C][=O][O-1][/C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a 2-(omega-methylthio)alkylmaleate(2-) obtained by deprotonation of both carboxy groups of 2-(3-methylthiopropyl)maleic acid; major species at pH 7.3. It is a conjugate base of a 2-(2-methylthiopropyl)maleic acid."}]