1 H and 13 C NMR spectra were recorded on Bruker Avance AVII400 and AVIIIHD400 FT-NMR spectrometers with 5 mm BBFO z-gradient probes, operating at a frequency of 400 MHz for 1 H NMR and 101 MHz for 13 C NMR respectively. LR-MS samples were analysed using a Bruker amaZon SL mass spectrometer equipped with a quadrupole analyser. Samples were introduced to the mass spectrometer via direct injection. Low resolution mass spectra were recorded using positive/negative ion electrospray ionization.