NSC676772 Olean-12-en-28-oic acid, 3-.beta.-[2-O-(.beta.-D-glucopyranosyl)- .beta.-D-glucopyranosyloxy]-, [2-O-[4-O-(.beta.-D-xylopyranosyl)-6-deoxy- .beta.-D-gulopyranosyl]-.beta.-L-arbinopyranosyl] ester