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. 2020 Apr 23;11:243. doi: 10.3389/fphar.2020.00243

FIGURE 1.

FIGURE 1

(i)1H NMR spectra of oleic acid (a), geranic acid (b), and choline bicarbonate (c); (ii) Esterification reactions between (a) oleic acid and choline cation to produce choline oleate [hydrogens (b) and (d) are the most affected by NMR spectra, when the 1H NMR spectrum of the ester is compared with the acid one], and (b) geranic acid and choline cation to produce choline geranate [hydrogens (a), (c), and (d) are the most affected by NMR spectra, when the 1H NMR spectrum of the ester is compared with the acid one].