Fig. 3
1H-NMR- and 13C-NMR-derived structures and spectra of the compounds isolated from the Pg-YP-I-22C fraction. The five compounds isolated from the Pg-YP-I-22C fraction were identified by one- and two-dimensional nuclear magnetic resonance spectroscopy (1D and 2D NMR) techniques and through comparisons with data reported in the literature. a, d, g, j, and m. Chemical structures. b, e, h, k and n. Proton spectra of each compound. c, f, i, l, and o. 13C spectra of each compound. a-c. Gallic acid. d-f. Naringin. g-i. Quercetin. j-l. Catechin. m-o. Hesperidin