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. From the ethyl acetate soluble fraction of the aerial part of Pterocypsela formosana, ten com… pounds were isolated and identified including apigenin (1), luteolin (2), caffeic acid (3), 3,5-di-Ocaaffeoylquinic acid (4), quercetin-3-0-β-glucoside (5), apigenin-7-0-β-glucuronide (6), aplgenm7-0-p-galacturonide (7), luteolin-7-0-p-glucuronide (8), luteolin-7-0-β-galacturonide (9) and luteolin-7-0-β-glucoside (10). The structures of these compounds were established by spectroscopic and chemical analysis.

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