Ceramide, 1-O-(O-6-deoxy-alpha-L-galactopyranosyl-(1-3)-O-(beta-D-galactopyranosyl-(1-4))-O-2-(acetylamino)-2-deoxy-beta-D-glucopyranosyl-(1-6)-O-(beta-D-galactopyranosyl-(1-3))-O-2-(acetylamino)-2-deoxy-beta-D-galactopyranosyl-(1-3)-O-alpha-D-galactopyranosyl-(1-4)-O-beta-D-galactopyranosyl-(1-4)-beta-D-glucopyranosyl)-