Fig. 8 in Recent advances in natural products as potential inhibitors of dengue virus with a special emphasis on NS2b/NS3 protease

Fig. 8. (a) The general structure of a flavonoid. (b) Chemical structures of the flavonoids – quercetin (14), kaempferol-3-O-rutinoside (16), rutin (17), hyperoside (18), the chromanone derivative (20), myricetin (23), apigenin (24), and luteolin (25), (c) pongamol (15), (d) epicatechin (19), catechin (27), EGCG (29), hesperetin (32), and hesperidin (33), (e) amentoflavone (21), (f) curcumin (22), (g) delphinidin (26), and (h) rotenone (30).