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General structure of iron(III) chelators. Hexadentate: desferrioxamine (DFO, 1), ethylenediaminetetraacetic acid (EDTA, 6); bidentate: 2,2′-bipyridyl (2), N,N-dimethyl-2,3,-dihydroxybenzamide (DMB) (3), acetohydroxamic acid (4), deferiprone (5), 1-hydroxypyridin-2-one (7), 3-hydroxypyridin-2-one (8), 1,10-phenanthroline (9), 8-hydroxyquinoline (10), 4-hydroxypyridopyrazine (11).
