Used as a crosslinking agent in bioconjugation processes, it enables the attachment of biomolecules such as proteins, peptides, or antibodies to other molecules or surfaces. The NHS ester group reacts with primary amines, forming stable amide bonds, while the bromo group allows for further functionalization or coupling reactions. It is particularly useful in modifying biomolecules for applications in drug delivery, diagnostics, and targeted therapy. Its PEG spacer enhances solubility and reduces steric hindrance, improving the efficiency of conjugation reactions. Commonly employed in the development of antibody-drug conjugates (ADCs) and other bioconjugates for therapeutic and research purposes.