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(A) Structures of metal-chelating dicarboxylic acids; (B) quantification of Fe3+ reduction by H2Q using a colorimetric ferrozine-based assay in in the presence of 1 mM oxalic acid and 1 mM L-(-)-malic acid after 5 min (black), 60 min (red) and 120 min (blue). Error bars indicate ±0.5 standard deviation (n = 3).
