cyclic phosphoric acid

cy·clic phos·phor·ic ac·id

1. in general, a linear polymer of phosphoric acid residues in pyrophosphate linkage in which the α and ω residues are similarly linked to make one endless loop or cyclic compound; 2. specifically, a generic term applied to compounds in which one phosphoric acid residue is esterified to two hydroxyl groups of a single carbon chain, as in adenosine 3',5'-phosphoric acid or adenosine 2',3'-phosphoric acid.