1. 1) “Saponins Used in Traditional and Modern Medicine,” eds. Waller, G. R., and Yamasaki, K., Plenum Press, New York, pp. 101–110 (1996).
2. 2) “Dictionary of Chinese Medicinal Materials” Vol. 8, Shanghai Scientific and Technological Press, Shanghai, pp. 78–79 (1999).
3. 14) Compound9was obtained as a mixture of the C-22 hydroxy and C-22 methoxy forms. The C-22 hydroxy form present in the mixture was completely converted to the C-22 methoxy form by treating with hot MeOH, and the structural elucidation of9was carried out with the C-22 methoxy form.