t-Boc-Aminooxy-PEG-amine is a compound used in pharmaceutical research and development as a functionalized polymer. It belongs to the class of polyethylene glycol (PEG) derivatives and has a t-butoxycarbonyl (t-Boc) protecting group, an aminooxy functional group, and an amine group. The aminooxy functional group allows for the specific labeling of biomolecules, such as proteins and antibodies, through the formation of oxime bonds. The PEG linker provides improved solubility and biocompatibility of the labeled biomolecules, making it an ideal tool for drug delivery and imaging applications. The t-Boc protecting group is used to temporarily protect the amine group during synthesis and can be removed later under mild conditions.