A new macrocyclic hexaamine ligand for the dissolution of human inorganic calculi.

Abstract
A newly synthesized 18-membered hexaamine carrying an acetate moiety on each nitrogen, L2 [1,4,7,10,13,16-hexacarboxymethyl-1,4,7,10,13,16-hexaazacyclooctadecane], was a more efficient dissolving agent than EDTA for human urinary calculi whose major components are CaPO4 and MgPO4. L2 is a good chelating agent for Ca2+ and Mg2+, and this chelating action is presumably responsible for the dissolution of inorganic calculi.