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Chromatograms of Polygonum multiflorum (PM) and standard acquired at 280 nm. Chromatograms of the standards: (a) rhein, (b) emodin, (c) chrysophanol, (d) physcion, (e) 2,3,5,4′-tetrahydroxystilbene-2-O-β-D-glucoside (TSG), and (f) PM. Peak numbering is shown in Table 1.
