[{"from": "human", "value": "Provide a description of this molecule. [C][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 1,1-bis(phosphonic acid) consisting of methane substituted by two phosphonic acid groups. It has a role as a bone density conservation agent and a chelator."}]