The 1 H NMR spectra were acquired using a Magritek Spinsolve 80 spectrometer operating at 80 MHz. Deuterated dimethyl sulfoxide (DMSO-d6) and chloroform (CDCl3) were used as solvents. For the stability test of 5-phenyl tetrazole, the spectra were recorded with solvent suppression using the sampled material dissolved in KOH/H2O without further workup.