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(a) Aromatic protons region of the 1H NMR titration spectra of Pu22T14T23 with aloe emodin-8-glucoside. Aromatic protons of 2 are indicated by asterisk (b) 2D NOESY spectrum of Aloe emodin-8-glucoside at 25 °C in H2O/D2O (9:1), 70 mM KCl, 25 mM potassium phosphate buffer (pH 6.9), R = 1.0. The boxes indicate the intermolecular NOE interactions between imino protons of the G-quadruplex and aromatic protons of the ligand. (c) Schematic representation of G-quadruplex structure.
