| 摘 要： | We isolated cucurbitacin Ⅱa from the rhizomes of Hemsleya pengxianensis, and tested the cytotoxicity of cucurbitacin Ⅱa against various cancer cell lines by the sulforhodamine B assay(SRB). At the same time, we preliminarily found that cucurbitacin Ⅱa has a certain inhibitory activity on kinase CDK1/cyclin B, and shows potent inhibitory activities against many cancer cell lines. The cucurbitacin Ⅱa was structurally characterized by specific optical rotation measurement, high-resolution mass spectroscopy and NMR spectroscopic analysis. In addition, the molecular structure of cucurbitacin Ⅱa was further determined by X-ray single-crystal crystallography.
|
