28-O-beta-D-xylopyranosyl-(1-->4)-alpha-L-rhamnopyranosyl-(1-->2)-(alpha-L-(5-O-acetyl)-arabinofuranosyl-(1-->3))-beta-D-(4-O-acetyl)-fucopyranosyl-gypsogenin-3-O-beta-D-galactopyranosyl-(1-->2)-beta-D-glucuronopyranoside