Used primarily in bioconjugation and chemical synthesis, it serves as a versatile linker for attaching functional groups to biomolecules. The azide group enables click chemistry reactions, particularly with alkynes, to form stable triazole linkages. The PEG4 spacer enhances solubility and reduces steric hindrance, making it suitable for modifying peptides, proteins, and other biomolecules. The Boc (tert-butyloxycarbonyl) protecting group ensures selective reactivity during synthesis, which can be removed under acidic conditions when needed. This compound is valuable in drug development, targeted delivery systems, and the creation of bioconjugates for research and therapeutic applications.