A β-D-N-acetyllactosamine (LacNAc) ligand equipped with an azide handle through a hydrophilic PEG3 spacer. The terminal azide couples to alkynes via copper-catalyzed azide-alkyne cycloaddition (CuAAC) or to DBCO and related strained alkynes via copper-free click chemistry, forming stable 1,2,3-triazole linkages. This compound provides an N-acetyllactosamine (LacNAc; Galβ1-4GlcNAc) building block, a core disaccharide of N- and O-glycans and a galectin ligand; it is a substrate for sialyltransferases and fucosyltransferases, enabling extension to sialylated and fucosylated structures.