[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is a trioxo monocarboxylic acid. It is a conjugate acid of a 2,4,6-trioxoheptanoate."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][C][C][=Branch1][C][=O][C][C][=Branch1][C][=O][C][=Branch1][C][=O][O]"}]