Used in bioconjugation processes to link biomolecules such as proteins, peptides, or antibodies to other molecules or surfaces. Its activated ester group reacts efficiently with primary amines, forming stable amide bonds, making it valuable in the development of immunoassays, drug delivery systems, and diagnostic reagents. Commonly employed in the synthesis of labeled probes and in immobilizing biomolecules on solid supports for biosensors and chromatography.