kõrgemates taimedes sisalduvad tsüklilised bioaktiivsed ühendid, kasutatakse antioksüdantidena
flavonoids, isoflavonoids and neoflavonoids are natural products derived from 2-phenylchromen-4-one (flavone), 3-phenylchromen-4-one and 4-phenylcoumarin, respectively
