Used in bioconjugation and chemical biology, this compound serves as a linker for attaching functional groups to biomolecules like proteins, peptides, or antibodies. Its azide group enables click chemistry reactions, particularly with alkynes, facilitating efficient and selective modifications. The carboxylic acid group allows for amide bond formation with amine-containing molecules, enabling further conjugation. The PEG spacer enhances solubility and reduces steric hindrance, making it suitable for applications in drug delivery, diagnostics, and surface functionalization. It is also employed in the development of bioprobes and therapeutic conjugates, where precise and stable molecular connections are essential.