3,4-Dibromo-Mal-PEG4-bis-PEG4-t-butyl ester is a branched PEG linker, including two protecting t-butyl groups that can be removed under acidic conditions and a dibromomaleimide group that allows for two points of attachment because both of the bromine atoms can be substituted. The PEG spacers bolster the water solubility of the molecule. The branched architecture allows for the attachment of multiple ADC payloads or other molecules.
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