N-(Azido-PEG2)-N-Boc-PEG3-t-butyl ester

N-(Azido-PEG2)-N-Boc-PEG3-t-butyl ester is a branched PEG molecule with a terminal azide group, Boc protected amine, and a terminal t-butyl ester. The azide group enables Click Chemistry. The Boc protected amine can be deprotected under acidic conditions, and the t-butyl protected carboxyl group can be hydrolyzed nder mild acidic conditions.