3-O-B-D-galactopyranosyl(1->2)-B-D-glucuronopyranosyl-3B,16alpha-dihydroxy-23-oxo-olean-12-en-28-oicacid-28-O-B-D-xylopyranosyl(1->4)-(B-D-glucopyranosyl(1->2))-alpha-L-rhamnopyranosyl(1->2)-B-D-fucopyranoside