beta-D-Galactopyranoside, (2alpha,3beta,5alpha,15beta,25R)-2,15-dihydroxyspirostan-3-yl) O-beta-D-glucopyranosyl-(1-3)-O-beta-D-galactopyranosyl-(1-2)-O-(beta-D-xylopyranosyl-(1-3))-O-beta-D-glucopyranosyl-(1-4