NSC676776 Olean-12-en-28-oic acid, 3-.beta.-[3-O-(.beta.-L-arabinopyranosyl)- .beta.-D-glucopyranuronosyloxy]-, [2-O-[[4-O-[3-O-(.beta.-D-xylopyranosyl)- .beta.-D-xylopyranosyl]-3-O-(.beta.-D-xylopyranosyl)]- 6-deoxy-D-gulopyranosyl]-.beta.-L-arabinosyl] ester