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Insets of methyl regions of 1H NMR spectra of 7 in various solvents. Panel A: in methanol-d4 containing varying percentages of added benzene-d6 in order verify the presence of two methyl doublets (with J values of 7.3 and 6.5 Hz). Panel B: in methanol-d4 with increasing levels of “resolution enhancement,” which confirmed these J values.
