Aminooxy-PEG2-bis-PEG3-DBCO serves as a branched PEG linker consisting of an aminooxy group that reacts with an aldehyde to form an oxime bond, which can be subsequently reduced to a hydroxylamine linkage. The linker also has two DBCO click chemistry handles to react with azides and PEG spacers to enhance solubility. Branched linkers allow for more payload attachment to ADC.
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