Polymethoxylated flavones flavone structure

Polymethoxylated flavones are almost exclusively found in citrus. The structure of some polymethoxylated flavones are shown in Fig. 14. The polymethoxylated flavones are an interesting group of bioactive compounds that are concentrated on the fruit surfaces (peel) and are pres-... 

Flavones have a close structural relationship to the flavonols, but unlike flavonols they are not widely distributed in plants. The only significant occurrences in plants are in celery, parsley, and a few other herbs, and they predominantly occur as 7-0-glycosides (e.g., luteolin and apigenin). In addition, polymethoxylated flavones have been found in citrus fruits (e.g., nobiletin and tangeretin). 

---