[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][Branch1][C][O][Branch1][=Branch2][P][=Branch1][C][=O][Branch1][C][O][O-1][P][=Branch1][C][=O][Branch1][C][O][O-1]"}, {"from": "gpt", "value": "The molecule is an organophosphonate dianion resulting from the removal of a proton from one of the hydroxy groups of each of the phosphonic acid groups of etidronic acid. The major species at pH 7.3. It is a conjugate base of an etidronic acid."}]