(3beta,4beta,16alpha,21beta,22alpha)-28-(Acetyloxy)-16,22,23-trihydroxy-21-[[(2E)-2-methyl-1-oxo-2-buten-1-yl]oxy]olean-12-en-3-yl O-beta-D-glucopyranosyl-(1-2)-O-[beta-D-glucopyranosyl-(1-4)]-beta-D-glucopyranosiduronic acid