Stauntoside R (compound 4) is a steroidal glycoside that can be isolated from the roots of Xu Changqing.
References:
[1].Lai C Z, Liu J X, Pang S W, et al. Steroidal glycosides from the roots of Cynanchum stauntonii and their effects on the expression of iNOS and COX-2[J]. Phytochemistry letters, 2016, 16: 38-46.
















