N-(DBCO-PEG8-carbonyl)-N-bis(PEG8-acid) constitutes a branched PEG linker including a DBCO to participate in click chemistry with azides and two carboxylic acid groups to react with primary amines in the presence of activators such as HATU. The PEG branches elevate the hydrophilicity of the compound. The branched architechture allows for more ADC payload attachment.
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