Used as a bifunctional coupling agent in peptide synthesis, enabling selective cross-linking of amino acids through active ester formation. Its stereochemistry supports controlled chiral assembly in complex molecule construction. Commonly applied in pharmaceutical intermediates where precise amide bond formation is required. Also utilized in bioconjugation for attaching payloads to antibodies or proteins under mild aqueous conditions. Shows high efficiency in solid-phase synthesis due to fast reaction kinetics and minimal racemization.