[{"from": "human", "value": "What can you tell me about this molecule? [O][=P][=Branch1][C][=O][O][P][=Branch1][C][=O][=O]"}, {"from": "gpt", "value": "The molecule is a divalent inorganic anion obtained by removal of both protons from diphosphonic acid. It is a phosphorus oxoanion and a divalent inorganic anion. It is a conjugate base of a diphosphonate(1-)."}]