Fig. 7. ¹H NMR spectrum (499.9 MHz, 293 K, CDCl₃) of rotaxane trans-R together with selected proton assignments. Resonances arising from the protons on the isoxazolidine ring are highlighted in purple. Resonances arising from the magnetically-inequivalent pyridine protons (red), NH (blue) and methylene protons (orange) located on the macrocycle, are shown as partial inset spectra. The sample also contains around 5% of cis-R.