N-(Azido-PEG2)-N-Boc-PEG4-acid

N-(Azido-PEG2)-N-Boc-PEG4-acid is a N-Boc protected, branched PEG linker with a azido and a terminal carboxylic acid. The azide group enables PEGylation via Click Chemistry. The protected amine can be deprotected under acidic conditions. The terminal carboxylic acid can react with primary amino groups in the presence of activators (e.g. EDC, or HATU).