NMR spectra of selected host-guest complexes were collected at 298 K on a 600 MHz Bruker Avance III spectrometer fitted with a 5 mm triple resonance cryoprobe with z-axis gradients. All NMR studies were run in phosphate buffer (0.1 M, pH 6.8), made up with 90% H2O and 10% D2O. 1H-NMR was collected with presaturation of the water peak, with 16 scans. 2D NOESY spectra were run with water suppression using excitation sculpting with gradients, States-TPPI acquisition mode, and a 500 ms mixing time.