Used as a heterobifunctional crosslinking agent in bioconjugation processes, particularly in the development of antibody-drug conjugates (ADCs). Its structure enables selective coupling between biomolecules such as proteins or antibodies and cytotoxic agents. The compound contains activated ester groups that react efficiently with primary amines on proteins under mild conditions, forming stable amide bonds. It is especially valued for its hydrolytic stability and controlled reactivity, which help minimize premature hydrolysis and improve conjugation efficiency. Commonly employed in pharmaceutical research to link targeting antibodies with drug payloads, enabling targeted delivery in cancer therapies. Its polyethylene glycol (PEG) spacer arms enhance solubility and reduce aggregation, improving the pharmacokinetic properties of the resulting conjugates.