2-(Acetylamino)-2-deoxy-4-O-beta-D-galactopyranosyl-D-glucose homopolymer 82441-98-3 D-Glucose, 2-(acetylamino)-2-deoxy-4-O-beta-D-galactopyranosyl-, homopolymer PNALA Poly(N-acetyllactosamine) Poly-N-acetyllactosamine