Studies on the Saponins of Ginseng. II. Structures of Ginsenoside-Re, -Rf and -Rg2

Abstract

Ginsenoside-Re, -Rf and -Rg2, the saponins of Ginseng root (root of Panax ginseng C.A. Meyer) were isolated. The structures of these saponins were established as being 20S-protopanaxatriol-6-[O-α-l-rhamnopyranosyl(1→2)-β-d-glucopyranoside]-20-O-β-d-glucopyranoside(II), 20S-protopanaxatriol-6-O-β-d-glucopyranosyl(1→2)-β-d-glucopyrano-side(III) and 20S-protopanaxatriol-6-O-α-l-rhamnopyranosyl(1→2)-β-d-glucopyranoside-(IV), respectively. © 1974, The Pharmaceutical Society of Japan. All rights reserved.