N-Mal-N-bis(PEG4-acid-amido-PEG24-t butyl ester) serves as a branched maleimide ester. The maleimide group will react with a thiol group, enabling the connection of a biomolecule with a thiol. The t-butyl ester can be hydrolyzed under acidic conditions. The hydrophilic PEG spacers enhance the water-solubility of the molecule.
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