[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is dianion of butanoyl phosphate arising from deprotonation of the phosphate OH groups; major species at pH 7.3. It is a conjugate base of a butanoyl dihydrogen phosphate."}, {"from": "gpt", "value": "[C][C][C][C][=Branch1][C][=O][O][P][=Branch1][C][=O][Branch1][C][O-1][O-1]"}]