Two new steroidal saponins from the roots of <i>Cynanchum limprichtii</i>

<p>As a part of our continuing research for bioactive constituents from <i>Cynanchum limprichtii</i> Schltr., two new C<sub>21</sub> steroidal glycosides limproside A (<b>1</b>) and limproside B (<b>2</b>) were isolated from the roots of <i>Cynanchum limprichtii</i>. Their structures were elucidated on the basis of 1D- and 2D-NMR spectroscopic data as well as HR-ESI-MS analysis. The cytotoxicity of two compounds against two selected human cancer cell lines was assayed.</p>