5-(Azido-PEG4)-pent-2-yn-1-ol

5-(Azido-PEG4)-pent-2-yn-1-Ol is a PEG linker containing an azide group and a terminal hydroxyl group. The hydrophilic PEG spacer increases solubility in aqueous media. The azide group can react with alkyne, BCN, DBCO via Click Chemistry to yield a stable triazole linkage. The hydroxyl group enables further derivatization or replacement with other reactive functional groups.