Used as a versatile linker in bioconjugation and chemical biology, enabling the attachment of biomolecules such as proteins, peptides, or antibodies to other functional groups or surfaces. Its azide group allows for click chemistry reactions, particularly with alkynes, making it valuable in labeling, imaging, and drug delivery systems. The pentaethylene glycol spacer provides flexibility and solubility, enhancing its efficiency in aqueous environments. It is also employed in the development of biosensors and diagnostic tools, where precise molecular interactions are critical. Additionally, it serves as a crosslinking agent in polymer chemistry for creating advanced materials with tailored properties.