Ethylenediaminediacetic acid (EDDA) is the organic compound with the formula C2H4(NHCH2CO2H)2. It is a derivative of two molecules of glycine, wherein the amines are linked. It is a white solid. The conjugate base is a tetradentate ligand. A representative complex is Na[Co(EDDA)(CO3)]. References Chelating agents Dicarboxylic acids