(3beta,16beta,23R)-16,23:16,30-Diepoxy-20-hydroxydammar-24-en-3-yl O-6-deoxy-alpha-D-galactopyranosyl-(1-2)-O-[O-beta-D-xylopyranosyl-(1-2)-beta-D-glucopyranosyl-(1-3)]-alpha-L-arabinopyranoside