FLAVONOIDS AND RELATED COMPOUNDS 



181 



TABLE 1 . SOME FLA VANONES AND FLA VANONOLS, 

 STRUCTURES AND OCCURRENCE 



OCH' 



hesperetin 

 (citrus fruits) 



butin 



(Biitea frondosa) 



naringenin 

 (citrus fruits) 



taxifolin 



(Pseudotsuga 



taxifolia) 



fustin (Quebracho Colorado) 



farrerol (Rhododendron) 



