t-Boc-Aminooxy-PEG5-azide（Cat No.:I015990）is a bifunctional PEG linker featuring a Boc-protected aminooxy group on one end and an azide group on the other, connected via a five-unit PEG spacer. The Boc group ensures temporary protection of the aminooxy functionality, enabling controlled deprotection for selective oxime or hydrazone ligation with aldehydes and ketones. Meanwhile, the azide group allows bioorthogonal click chemistry reactions such as CuAAC or SPAAC. The PEG5 backbone enhances solubility, flexibility, and biocompatibility. This reagent is valuable in bioconjugation, drug discovery, and materials science for constructing multifunctional biomolecules.