Picolyl azide-PEG4-NHS ester is a bifunctional PEG linker comprised of a picolyl moiety that assists with a copper-chelating system within its structure, lowering the amount of copper catalyst required in the CuAAC reaction for the azide and an NHS ester that directly and efficiently reacts with amine-bearing moieties. The PEG4 chain improves the compound's water solubility.
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