N-(Azido-PEG3)-N-Boc-PEG4-NHS ester is a branched PEGylation reagent with a terminal azide group (N3), a Boc protected amine (NH2), and a terminal NHS ester.The azide group enables PEGylation via Click Chemistry. The NHS ester can be used to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules. The protected amine can be deprotected under acidic conditions.
