FLAVONOIDS AND RELATED COMPOUNDS 



175 



C-OH 



flavonols 



■s/\ 



II 







other variations in the Cg - C3 - Cg pattern also occur and are denoted as follows: 



\ 



II 







CH— 



I 



CH 



chalcones 



CHo — 



\ 



C 



dihydrochalcones 



( 



C^CH— 



A 



^v-v 



CH 



II 

 



aurones 



isoflavones 



