[{"from": "human", "value": "Describe this molecule. [C][=Branch1][C][=O][Branch1][=Branch1][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a dicarboxylic acid monoanion. It is functionally related to a malonate(1-). It is a conjugate base of an oxomalonic acid. It is a conjugate acid of an oxomalonate(2-)."}]