[{"from": "human", "value": "Provide a description of this molecule. [O][P][=Branch1][C][=O][=O]"}, {"from": "gpt", "value": "The molecule is a monovalent inorganic anion obtained by deprotonation of one of the two OH groups in phosphonic acid. It is a phosphorus oxoanion and a monovalent inorganic anion. It is a conjugate base of a phosphonic acid. It is a conjugate acid of a phosphonate(2-)."}]