[{"from": "human", "value": "Generate a molecule based on this description. The molecule is an oxo dicarboxylic acid. It is functionally related to a malonic acid. It is a conjugate acid of an oxomalonate(1-)."}, {"from": "gpt", "value": "[C][=Branch1][C][=O][Branch1][=Branch1][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O]"}]