N-(t-butyl ester-PEG3)-N-bis(PEG3-Mal) is a branched conjugation reagent with a terminal t-butyl group and a terminal pair of amine groups. The maleimide group will react with a thiol group to form a covalent bond, enabling the connection of biomolecule with a thiol. The t-butyl protected carboxyl group can be deprotected under acidic conditions. The hydrophilic PEG spacer increases the hydrophilic properties of the compound. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.