Chemical shift differences for G-quadruplex peaks indicative of ligand interaction.

Compound	Difference from 1.58 ppm (ppm) T6CH3	Difference from 7.23 ppm (ppm) T6H6/8	Difference from 11.55 ppm (ppm) G3NH	Difference from 11.22 ppm (ppm) G4NH	Difference from 10.86 ppm (ppm) G5NH
2a	0.09	0.17	−0.04	−0.08	−0.2
2b	0.093	0.22	−0.066	−0.135	−0.34
2e	0.146	0.19	−0.056	−0.11	−0.24
2c	0.157	0.126	−0.06	−0.115	−0.25
2d	0.094	0.16	−0.03	−0.07	−0.13