Used primarily in bioconjugation and click chemistry, this compound serves as a versatile linker for attaching biomolecules, such as proteins, peptides, or antibodies, to other molecules or surfaces. Its DBCO (dibenzocyclooctyne) group enables strain-promoted azide-alkyne cycloaddition (SPAAC), a fast and efficient reaction without the need for catalysts. The PEG4 spacer provides flexibility and solubility, enhancing the stability and functionality of the conjugated products. It is particularly useful in drug delivery systems, diagnostic assays, and the development of targeted therapeutics, where precise and stable molecular connections are critical. Additionally, it finds applications in material science for surface modification and functionalization of nanoparticles or polymers.