preferred_name: O-.ALPHA.-D-GALACTOPYRANOSYL-(1->2)-O-3-O-(HYDROXY(2-HYDROXY-1-(HYDROXYMETHYL)ETHOXY)PHOSPHINYL)-.BETA.-D-GALACTOPYRANOSYL-(1->4)-O-2-(ACETYLAMINO)-2-DEOXY-.BETA.-D-GLUCOPYRANOSYL-(1->3)-O-.BETA.-D-GALACTOPYRANOSYL-(1->4)-.BETA.-D-GLUCOPYRANOSE