Poimeros chelating anion and applications thereof.

Use of a polymer in the manufacture of a pharmaceutical composition for treating a selected condition among hyperphosphatemia, hypocalcemia, hyperparathyroidism, depressed renal synthesis of calcitriol, tetany due to hypocalcemia, renal insufficiency, ecotopica calcification in soft tissues, chronic renal failure and anabolic metabolism, the polymer being a crosslinked amine polymer comprising an amine monomer, wherein the amine is crosslinked with a crosslinking agent, the amine monomer an amine of formula (I) ** ** see formula wherein each n, of independently, it is equal to or greater than 3; m is equal to or greater than 1; and each R1, independently, is H or alkyl or optionally substituted aryl or is linked to a next R1 to form an alicyclic, aromatic, or heterocyclic group optionally substituted, or formula (IV) ** ** see formula in wherein each n, independently, is equal to or greater than 3; each r, independently, is 0, 1, or 2; and each R1, independently, is H or alkyl or optionally substituted aryl or is linked to R1 to form near alicyclic, aromatic, or heterocyclic optionally substituted.