4-Nitrophenyl O-β-D-Galactopyranosyl-(1→4)-O-2-(acetylamino)-2-deoxy-β-D-glucopyranosyl-(1→3)-O-β-D-galactopyranosyl-(1→4)-2-(acetylamino)-2-deoxy-β-D-glucopyranoside is an N-acetyllactosamine oligomer that can be useful as a precursor to blood group antigens. It also acts as a substrate for glycosyltransferases in the production of glycoconjugates.