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Five new steroidal glycosides, named as stauntosides D1 (1), D2 (2), D3 (3), I1 (4), and I2 (5), were isolated from the 95% ethanol extract of the roots of Cynanchum stauntonii. Their structures were elucidated by extensive spectroscopic analyses, including 1D, 2D NMR, and HRESI–MS, and qualitative chemical methods. All compounds were tested for cytotoxicity against five human tumor cell lines (HCT-8,...
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