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Four new resveratrol oligomers, nepalensinols D-G, were isolated from the stem of Kobresia nepalensis (Cyperaceae). The structures were determined by detailed NMR spectral analysis. The compounds were assessed for their inhibitory activity against human topoisomerase II, a potential target of anti-tumor agents. These stilbenoids showed potent inhibitory activity against human topoisomerase II with IC50 values of 5-15 microM.

Nepalensinols D-G, New Resveratrol Oligomers from Kobresia nepalensis (Cyperaceae) as Potent Inhibitors of DNA Topoisomerase II