The 1H-NMR spectra was challenging due to two diastereotopic doublet of quartet protons at a similar chemical shift of 4.12 ppm shown in Figure . The 3.5 Sonnet structure also supported other resonances found in the aromatic region, 2 methyls, and 1 isopropyl group. GCOSY60 proton resonances also supported the model's predicted compound. The GTOCSY spectrum contained an author interpretation error for the 3H 1.48 ppm methyl that should be correlating to the methine at 3.68 ppm. The challenging part of the spectrum was that the isopropyl group at 0.89 ppm displayed long range scalar correlations to other parts of the molecule such as the diastereotopic protons at 4.12 ppm. Other spectra also displayed this type of overloading effect to different parts of the molecule such as GHMQC interactions between the methyl at 1.48 ppm and the isopropyl group.