Figure 2. The basic structure of four Citrus flavonoids. (A) Molecular structure of the flavone backbone with numbers. (B) Backbone of a flavonol, substituent numbers are indicated (C) Flavanone skeleton with locants. (D) The basic chemical structure of anthocyanins

From

Citrus Flavonoids and Human Cancers

Zunli Ke, Yu pan, Xiaodan Xu, Chao Nie, Zhiqin Zhou

Journal of Food and Nutrition Research. 2015, 3(5), 341-351 doi:10.12691/jfnr-3-5-9