The acivity-guided fractionation upon the MeOH extract of the aerial p
arts of Sorbaria sorbifolia var. stellipila led to the isolation of tw
o cucurbitacin-compounds, cucurbitacin D and cucurbitacin F, as active
principles. Two compounds were shown to exhibit significant cytotoxic
ity against cultured human tumor cell lines, A-549, SK-OV-3, SK-MEL-2,
XF-498, and HCT 15.