This compound is primarily utilized in bioconjugation and chemical biology applications. It serves as a linker or spacer in the modification of biomolecules, such as proteins, peptides, or antibodies, enabling targeted drug delivery systems. The bromo group allows for specific reactions, such as nucleophilic substitution, facilitating the attachment of functional groups or molecules. The PEG3 spacer enhances solubility and reduces immunogenicity, making it suitable for therapeutic applications. Additionally, it is used in the development of proteolysis-targeting chimeras (PROTACs) and other bifunctional molecules for targeted protein degradation. Its acid group provides a handle for further conjugation or coupling reactions, expanding its utility in drug discovery and biopharmaceutical research.