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(a) Structure of the β-cyclodextrin- benzoic acid complex, as solved by X-ray crystallography in 2003 by Aree et al. (b) 13C NMR spectrum of natural abundance hyperpolarized benzoic acid, obtained in a single 5° pulse at 36.4 mM (310K, pH = 7.8). All carbons are observed: C1-176.6 ppm, C2-137.3 ppm, C3,C7- 129.8 ppm, C4,C6- 129.3 ppm and C5-132.2 ppm.
