The Role of Bioactive Compounds in Natural Products Extracted from Plants in Cancer Treatment and Their Mechanisms Related to Anticancer Effects

Table 3

Polyphenol classification.

Polyphenolic compounds	Sources	Examples	Chemical structure
Flavonoids	Chocolate, red wine, tea, apple, onions, broccoli, olives	Flavonols, flavones, flavanones, isoflavonoids, anthocyanidins, flavanols
Phenolic acids	Coffee, black tea, cereals	Benzoic acid, cinnamic acid
Stilbenes	Grapes, peanuts, red wine	Resveratrol
Lignans	Flaxseed oil, clover, lucerne	Secoisolariciresinol, matairesinol