This chemical is widely used in bioconjugation and click chemistry applications, particularly for modifying biomolecules such as proteins, peptides, and antibodies. Its azide group allows for efficient and selective reactions with alkyne-functionalized compounds via copper-catalyzed azide-alkyne cycloaddition (CuAAC), enabling the creation of stable triazole linkages. The PEG3 spacer enhances solubility and reduces steric hindrance, improving the efficiency of conjugation processes. Additionally, the chloroacetamide group provides a reactive site for thiol-based coupling, making it versatile for attaching to cysteine residues or other thiol-containing molecules. This compound is valuable in drug delivery systems, biolabeling, and the development of targeted therapeutics, where precise and stable molecular modifications are essential.