3-O-[(2S,3R,4R)-3,4-Dihydroxy-4-(hydroxymethyl)tetrahydro-2-furanyl]-b-D-xylopyranosyl-(1->4)-6-deoxy-a-L-mannopyranosyl-(1->2)-1-O-[(2b,3b,16a)-3-(b-D-glucopyranosyloxy)-2,16,23,2 4-tetrahydroxy-28-oxoolean-12-en-28-yl]-a-L-arabinopyranose