New Spirostanol Sulfonate from the Rhizomes of Helleborus thibetanus(Ranunculaceae)
YANG Feng-ying1, SU Yan-fang1,2*, ZHANG Xiao1, TU Guang-zhong3, GAO Xiu-mei2 and ZHANG Bo-li2
Chemical Research in Chinese Universities . 2010, (5): 746 -748 .