N-(DBCO-PEG4)-N-bis(PEG4-MMAE) functions as a branched PEG linker which may be employed in the construction of antibody-drug conjugates. The DBCO group can be used for copper-free Click Chemistry reactions. The MMAE groups are synthetic antineoplastic agents which can eliminate cancer cells. The PEG4 spacers enhance the molecule's hydrophilicity.
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