A ginsenoside found in Panax ginseng that is dammarane which is substituted by hydroxy groups at the 3beta, 6alpha, 12beta and 20 pro-S positions, in which the hydroxy groups at positions 6 and 20 have been converted to the corresponding alpha-L-rhamnopyranosyl-(1->2)-beta-D-glucopyranoside and beta-D-glucopyranoside respectively, and in which a double bond has been introduced at the 24-25 position.