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Chromatographic profiles at 210 nm and 350 nm of the two fractions containing the C-glycosylated flavonoids recovered by semi-preparative HPLC; 9 and 10, neocarlinoside/isocarlinoside/carlinoside; 11, isoschaftoside; 13, schaftoside (UV–VIS spectra of peaks 9 and 13 and chemical formula of carlinoside and schaftoside are also shown).
