Two new cytotoxic stilbenoid dimers isolated from Cajanus cajan
Nenling Zhang1,2, Xiangchun Shen3, Xiaofei Jiang4
1Pharmacy College of Guizhou Medical University, University Town, Gui'an New District, Guiyang, 550025, China. nenlingzhang@qq.com.
Abstract:
Two new stilbenoid dimers, cajanstilbenoids A (1) and B (2), were isolated from the leaves of Cajanus cajan. Planar structures of these compounds were verified by NMR (1D and 2D) and high-resolution electrospray ionization mass spectroscopy (HR-ESI-MS). Absolute configurations were assigned by comparing experimental and calculated electronic CD values. The cytotoxicity of 1 and 2 against human hepatoma (HepG2), human breast adenocarcinoma (MCF-7), and human lung cancer (A549) cells were evaluated in vitro. Compound 1 showed strong cytotoxicity against all the tested cell lines (IC50 values: 2.14-2.56 µM), whereas compound 2 showed strong toxicity only against HepG2 (IC50 value: 5.99 µM) and A549 cells (IC50 value: 6.18 µM).
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