N-(Amine-PEG4)-N-bis(PEG4-t-butyl ester) represents a branched PEG linker, including two t-butyl ester groups, which can be deprotected under acidic conditions, and a terminal amine, which is reactive with carboxylic acids, activated NHS esters, carbonyls (ketone, aldehyde), etc. The branched structure allows for attachment of ADC payloads or other molecules.
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