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Two new (1–2) and two known C21 steroids (3–4) were isolated from the roots of Cynanchum atratum. Their structures were elucidated by detailed 1D and 2D spectroscopic. The MTT assay showed that compounds 1–4 displayed obvious cytotoxic activities against HepG2 cells with IC50 values ranging from 10.19μM to 76.12μM. Compounds 1–3 also exhibited cytotoxic effects in A549 cells with IC50 values of 30...
Two new (1–2) and three known (3–5) C21 steroidal glycosides were isolated from Cynanchum stauntonii. Their structures were elucidated on the basis of 1D and 2D-NMR spectroscopic data as well as HRTOFMS analysis. The cytotoxicity of the compounds against A549, HepG2, and 4T1 cell lines were evaluated by MTT assay. Compound 4 exhibited good inhibitory activities with the IC50 values 26.82, 12.24, and...
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