N-(Azide-PEG8)-N-bis(PEG8-Amine) is a trifunctional PEG reagent containing two primary amines and one azide. The primary amine is reactive with carboxylic acids, NHS esters, or carbonyls to form a variety of stable bonds. The azide can be used to do click chemistry with terminal alkynes or strained cyclooctynes like DBCO or BCN.
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