Azide-PEG-acid, MW 5,000 is a polyPEG reagent with an azide group with a terminal carboxylic acid. The azide group can react with alkyne, BCN, DBCO via Click Chemistry. The terminal carboxylic acid can react with primary amine groups in the presence of activators (e.g. HATU). The 5k PEG polymer increases the water-solubility of the molecule.
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