[{"from": "human", "value": "Please give me some details about this molecule. [C][C][Branch1][C][O][Branch1][=Branch2][P][=Branch1][C][=O][Branch1][C][O][O][P][=Branch1][C][=O][Branch1][C][O][O]"}, {"from": "gpt", "value": "The molecule is a first generation bisphosphonate similar to [clodronic acid] and [tiludronic acid]. These drugs were developed to mimic the action of pyrophosphate, a regulator of calcification and decalcification. Etidronate\u2019s use has decreased over the years in favor of the third generation, nitrogen containing bisphosphonate [zoledronic acid], [ibandronic acid], [minodronic acid], and [risedronic acid].  Etidronic acid was granted FDA approval on 1 September 1977."}]