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1H NMR spectra of quercetin (5 mM) and the titration with Zn2+ in d6-DMSO/D2O (v/v : 50/50), 50 mM Tris-HCl, pH* 7.20. (a) quercetin only; (b) to (f), with the addition of 0.25, 0.50, 0.75, 1.0 and 2.0 mol eq. of Zn2+, respectively.