Used primarily in bioconjugation and chemical biology, this compound serves as a versatile linker for attaching biomolecules. Its isothiocyanate group reacts with amines, enabling covalent bonding to proteins or peptides, while the azide group allows for click chemistry reactions, such as CuAAC (copper-catalyzed azide-alkyne cycloaddition). This dual functionality makes it ideal for creating stable, site-specific conjugates in drug delivery systems, antibody-drug conjugates, and labeling studies. Additionally, its PEG spacer enhances solubility and reduces steric hindrance, improving the efficiency of molecular interactions in biological systems.