All the compounds are colorless or off-white, except 15, which is green.* Elemental analytical data were submitted for review. LH. 2H20 (LH= hydroxamic acid). undergone preliminary clinical trials for the same (7). We therefore report here the synthesis of a series of dihydroxamic acids,(CH,),[CON (R) OH],, with increasing chain length and different substituents on nitrogen in order to investigate their influence, if any, on the iron chelation ...