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Metal chelating activity of compounds HT1 (A) and HT2 (B). UV spectra of compounds HT1 and HT2 UV-vis (200–400 nm) absorption spectra of HT1 and HT2 (75 μM) alone or with CuSO4 (150 μM), FeSO4 (150 μM), FeCl3 (150 μM), or ZnCl2 (150 μM), in MeOH.
