[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is the conjugate base of oxaluric acid; major species at pH 7.3. It is a conjugate base of an oxaluric acid."}, {"from": "gpt", "value": "[C][=Branch1][C][=O][Branch1][=Branch1][C][=Branch1][C][=O][O-1][N][C][=Branch1][C][=O][N]"}]