3-(methylmaleimido)propionic acid N-Succinimidyl ester

3-(Methylmaleimido)propionic acid N-succinimidyl ester is a thiazoline-based crosslinking agent featuring a methyl-substituted maleimide moiety conjugated to a propionic acid spacer and an N-succinimidyl ester. The maleimide group enables thiol-specific Michael addition, while the succinimidyl ester facilitates amide bond formation with primary amines. This bifunctional reagent serves as a site-specific conjugation intermediate in bioconjugation protocols, enabling precise linkage of thiol- and amine-containing biomolecules. It acts as a synthetic intermediate in the preparation of homogeneous antibody-drug conjugates and protein crosslinking studies.