A β-D-lactose ligand equipped with a primary amine through a hydrophilic PEG3 spacer. The amine couples with NHS-activated esters to form stable amide bonds, providing a route to conjugate the ligand onto NHS-activated molecules and surfaces. This compound provides a lactose (Galβ1-4Glc) building block for glycoconjugate synthesis and the construction of probes for galactose-recognizing proteins, including galectins and the hepatic asialoglycoprotein receptor; it is a substrate for sialyltransferases and other glycosyltransferases.

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