This compound is widely used in bioconjugation and click chemistry applications. It serves as a versatile linker for attaching biomolecules, such as proteins, peptides, or antibodies, to other functional groups or surfaces. The endo-BCN group enables strain-promoted azide-alkyne cycloaddition (SPAAC), a bioorthogonal reaction that allows for efficient and selective labeling without interfering with biological processes. The PEG8 spacer provides flexibility and solubility, enhancing the stability and performance of the conjugate in aqueous environments. Additionally, the NHS ester group reacts with primary amines, enabling covalent attachment to target molecules. This makes it valuable in drug delivery, diagnostic imaging, and the development of targeted therapeutics.