b-D-Glucopyranosiduronic acid, (3b,4b,16a,21b,22a)-28-(acetyloxy)-16,22,23-trihydroxy-21-[[(2E)-2-methyl-1-oxo-2-buten-1-yl]oxy]olean-12-en-3-ylO-b-D-glucopyranosyl-(1®2)-O-[b-D-glucopyranosyl-(1®4)]-