Used extensively in bioconjugation and chemical synthesis, this compound serves as a versatile linker for attaching functional groups to biomolecules like proteins, peptides, and antibodies. Its PEG4 spacer enhances solubility and reduces steric hindrance, making it ideal for creating stable conjugates in drug delivery systems. The propargyl group enables click chemistry reactions, particularly with azides, facilitating efficient and selective modifications. Additionally, it is employed in the development of targeted therapies, diagnostic agents, and materials for biomedical research. Its bromine moiety allows for further functionalization, expanding its utility in organic synthesis and polymer chemistry.