[{"from": "human", "value": "Generate a molecule based on this description. The molecule is the ester or anhydride formed by condensation between diphosphoric and acetic acids."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][O][P][=Branch1][C][=O][Branch1][C][O][O][P][=Branch1][C][=O][Branch1][C][O][O]"}]