Lawsone (Hennotannic acid) (2-hydroxy-1,4-naphthoquinone), also known as hennotannic acid, is a red-orange dye present in the leaves of the henna plant (Lawsonia inermis) as well as in the flower of water hyacinth (Eichhornia crassipes).

(±)-Eriodictyol（Dihydroluteolin） is the racemate, while Eriodictyol contains only the (+)-Eriodictyol configuration. (±)-Huazhongilexone is a naturally occurring flavonoid with a variety of biological activities including antioxidant, anti-inflammatory, and anticancer activities, and is a potent inhibitor of melanogenesis, and is also used as a food additive.