SMILES: O[P+](=O)O[P+](=O)[O-]
Description: The molecule is a monovalent inorganic anion obtained by deprotonation of one of the two OH groups in diphosphoniic acid. It is a phosphorus oxoanion and a monovalent inorganic anion. It is a conjugate base of a diphosphonic acid. It is a conjugate acid of a diphosphonate(2-).