N-(Amine-PEG4)-N-bis(PEG4-N-Boc) serves as a branched PEG linker comprised of a terminal amine group that is reactive with carboxylic acids, activated NHS esters, carbonyls (ketone, aldehyde), etc. The two N-Boc groups can be deprotected to allow for reactions with carboxylic acids and other carbonyl groups like aldehydes or ketones.
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