O-2-(acetylamino)-2-deoxy-a-D-galactopyranosyl-(1->3)-O-[6-deoxy-a-L-galactopyranosyl-(1->2)]-O-b-D-galactopyranosyl-(1->3)-O-2-(acetylamino)-2-deoxy-b-D-glucopyranosyl-(1->3)-O-b-D-galactopyranosyl-(1->4)-D-Glucose