[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is a 2-(omega-methylthio)alkylmaleate(2-) obtained by deprotonation of both carboxy groups of 2-(2-methylthio)ethylmaleic acid; major species at pH 7.3. It is a conjugate base of a 2-(2-methylthio)ethylmaleic acid."}, {"from": "gpt", "value": "[C][S][C][C][/C][=Branch1][#Branch1][=C][/C][=Branch1][C][=O][O-1][/C][=Branch1][C][=O][O-1]"}]