Figure 1. Chemical structures of TS (A) and TA (B)

From

In vitro Anti-angiogenic Effects of Tea Saponin and Tea Aglucone on Human Umbilical Vein Endothelial Cells

Xiaohong Li, Baozhan Huang, Fan Fei, Hai Niu, Wen Huang

Journal of Food and Nutrition Research. 2015, 3(3), 206-212 doi:10.12691/jfnr-3-3-13