-The proton at 8. The original 1H-NMR spectra for Prompt B contained other unlabeled impurities, such as the tall 3.3 ppm resonance and 1.25 ppm resonance outside of the 7 labeled protons and unlabeled amine protons seen in Figure . These additional 1H-NMR resonances may have affected the LMM's ability to solve the more complex molecule. The 13C-NMR and DEPT-NMR spectra do appear to match the paper's molecule.