<chemical> A chelating agent relatively more specific for calcium and less toxic than edetic acid (edta). It has been used in the treatment of urolithiasis. ... Pharmacological action: antidotes, chelating agents. ... Chemical name: 6,9-Dioxa-3,12-diazatetradecanedioic acid, 3,12-bis(carboxymethyl)- ... (12 Dec 1998) ...