[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is an oxo dicarboxylate. It is functionally related to a malonate(2-). It is a conjugate base of an oxomalonate(1-)."}, {"from": "gpt", "value": "[C][=Branch1][C][=O][Branch1][=Branch1][C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O-1]"}]