28-O-beta-D-xylopyranosyl-(1-->4)-alpha-L-rhamnopyranosyl-(1-->2)-(alpha-L-arabinofuranosyl (1-->3))-beta-D-(4-O-acetyl)-fucopyranosyl-gypsogenin-3-O-beta-D-galactopyranosyl-(1-->2)-beta-D-(6-O-butyl ester)-glucuronopyranoside