Aminooxy-PEG-Azide(Azido-PEG-Aminooxy) is a versatile compound used in pharmaceutical research and development. It belongs to a class of molecules known as PEGylated reagents, which are commonly used in drug discovery and development processes. The compound contains three functional groups: an aminooxy group, a polyethylene glycol (PEG) spacer, and an azide group. The aminooxy group is reactive towards aldehydes and ketones, while the azide group can participate in copper-catalyzed click reactions with terminal alkynes. The PEG spacer imparts solubility and biocompatibility to the molecule. Due to its functional groups and PEGylation, Aminooxy-PEG-Azide can be used for drug conjugation, targeted drug delivery, and bioconjugation.