[{"from": "human", "value": "Describe this molecule. [C][S][C][C][C][/C][=Branch1][#Branch1][=C][/C][=Branch1][C][=O][O][/C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a 2-(omega-methylthio)alkylmaleic acid in which the 2-alkyl group is specified as 3-(methylthio)propyl. It is a conjugate acid of a 2-(2-methylthio)propylmaleate(2-)."}]