326724.fig.001
Figure 1: Structures of the six main kavalactones (1–6), Pipermethysticine (7), and Flavokavain B (8). The chemical formulae are kavain (C14H14O3), 7,8-dihydrokavain (C14H16O3), methysticin (C15H14O5), 7,8-dihydromethysticin (C15H16O5), yangonin (C15H14O4), desmethoxyyangonin (= 5,6-dehydrokavain = C14H12O3), pipermethystine (C16H17NO4), and flavokavain B (C17H16O4).