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