N-(Acid-PEG2)-N-bis(PEG3-azide)

N-(Acid-PEG2)-N-bis(PEG3-azide) is a PEG linker containing two azide groups and a carboxylic acid. The azide groups enable PEGylation via Click Chemistry. The terminal carboxylic acid can react with primary amine groups in the presence of activators (e.g. EDC, or HATU) to form a stable amide bond.