Figure 2. Expansion of the NOESY stacked-plot spectrum showing the cross-peaks for the H- 7 protons of both isomers. The cross-relaxation with the hydmxymethyl protons (H-5) establishes the regiochemistry of the substituents 4, 5 on the imidazolyl ring of isomer 9. This particular cross peak is missing for isomer 8, while all other cross-relaxation for H-7 are very similar. The cross-peaks are anti-phase with respect to the diagonal peak at 6.4 ppm as in ...