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Azido-PEG3-Maleimide is provided as a kit of two vials. Azido-PEG3-Maleimide is not stable for storage; it needs to be made in situ by mixing Azido-PEG3-amine and Maleimide-NHS ester followed by shaking/ stirring for 30 minutes at room temperature. The maleimide group of the Azido-PEG3-Maleimide can react with a thiol group to form a covalent bond, enabling the connection of biomolecule with a thiol. Azide group enables Click Chemsitry reactions.

Azido-PEG3-maleimide is a PROTAC linker belonging to the PEG class, which can be used to synthesize PROTAC molecules. Azido-PEG3-maleimide is also a cleavable ADC linker containing 3-unit PEG, which can be used to synthesize antibody drug conjugates (ADCs).