N-(NHS ester-PEG6)-N-bis(PEG6-N-Boc) is a trifunctional PEG linker that combines an activated NHS ester and two Boc-protected amines ligated together at a tertiary amine. The NHS ester is highly reactive towards nucleophiles like amines while the Boc protected amine can be deprotected and used in coupling reactions with carboxylic acids or activated esters.
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