Figure 1. Chemical structure of oleanolic acid

From

Oleanolic acid Separation From Grape Skins by Aqueous Two-phase Extraction and Estimate Its Antioxidant Activity

Xifeng Zhang, Fenqin Zhang, Guanghong Luo, Shenghui Yang, Danxia Wang

Journal of Food and Nutrition Research. 2015, 3(1), 34-39 doi:10.12691/jfnr-3-1-6