N-(DBCO-PEG8-carbonyl)-N-bis(PEG8-NHS ester) functions as a branched PEG linker with a DBCO group to react with azides and two NHS ester groups to directly and efficiently react with amine-bearing biomolecules. The PEG branches improve the solubility of the compound in aqueous media. Branched linkers allow for more payload attachment to ADC.
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