preferred_name: O-(N-ACETYL-.ALPHA.-NEURAMINOSYL)-(2->3)-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-GLUCOPYRANOSE