Figure 2

Chemical structures of flavonoids identified in B. longifolia . (1) guaijaverin (quercetin-3-O-α-arabinoside); (2) quercetin; (3) quercitrin (quercetin-3-O-α-rhamnoside); (4a) isoquercitrin (quercetin-3-O-β-glucoside); and (4b) hyperin (quercetin-3-O-β-galactoside).