Used extensively in bioconjugation and protein labeling, this compound facilitates the attachment of polyethylene glycol (PEG) chains to biomolecules, enhancing their stability and solubility. It is particularly valuable in modifying antibodies, peptides, and other proteins for therapeutic and diagnostic applications. The NHS ester group enables efficient coupling with primary amines, while the bromoacetamido group allows for thiol-specific reactions, offering versatility in bioconjugation strategies. This chemical is instrumental in developing PEGylated drugs, improving their pharmacokinetics and reducing immunogenicity. It also finds use in creating targeted drug delivery systems and advanced imaging probes.