Fig. 4From: Pharmacological activity and quantitative analysis of flavonoids isolated from the flowers of Begonia semperflorens Link et OttoMolecular structures of flavonoids from Begonia semperflorens flowers. a HPLC chromatogram of the isolated flavonoids (b) and EtOAc fraction (c) from the flowers of Begonia semperflorens. 1 (quercetin, rt: 29.3′), 2 (kaempferol, rt: 36.0′), 3 (astragalin, rt: 15.6′), 4 (isoquercetin, rt: 14.6′)Back to article page