[{"from": "human", "value": "Provide a description of this molecule. [C][=Branch1][C][=O][O-1].[C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a dicarboxylate that contains four carbon atoms. It is a conjugate base of a C4-dicarboxylic acid."}]