Two new steroidal saponins from the roots of Cynanchum limprichtii. - Liu, Jia-Chuan; Yu, Li-Li; Tang, Ming-Xu; Lu, Xiao-Jie; Zhao, Dan; Wang, Hai-Feng; Chen, Gang; Su, Guang-Yue; Pei, Yue-Hu (Journal of Asian Natural Products Research, 2018)