This compound is widely used in bioconjugation and click chemistry applications due to its functional groups. The azide group allows for efficient and selective reactions with alkynes via the copper-catalyzed azide-alkyne cycloaddition (CuAAC) reaction, making it valuable for labeling biomolecules such as proteins, peptides, and nucleic acids. The acetylthio group can be deprotected to yield a free thiol, enabling thiol-based conjugation strategies. The PEG3 spacer enhances solubility and reduces steric hindrance, improving the efficiency of conjugation processes. It is particularly useful in drug delivery systems, bioconjugate synthesis, and the development of diagnostic probes.