Further investigation on the saponins of the flower-buds of Panax ginseng C. A. Meyer has resulted in the isolation and structural elucidation of a pair of new 24-epimers of dammarane type saponins named ginsenoside I and II. The structures of the epimers were characterized on the basis of chemical and spectral evidence as 3-O-[β-D-glucopyranosyl-(1→2)-β-D-glucopyranosyl]-20-S-O-β-D-glucopyranosyl-3β,12β,20(S)-trihydroxy-24ξ-hydroperoxydam-mar-25-ene, except for their C-24 configurations. Ginsenoside Ⅰ is a new triterpene glycoside,and ginsenoside Ⅱ is a known compound first isolated from a natural plant.
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