This compound is widely used in bioconjugation and chemical biology due to its unique functional groups. The azide group enables click chemistry reactions, particularly with alkynes, making it valuable for labeling biomolecules like proteins, peptides, or nucleic acids. The PEG4 spacer enhances solubility and reduces steric hindrance, improving reaction efficiency in aqueous environments. The hydrazide group allows for specific conjugation with aldehydes or ketones, often used in glycoprotein labeling or modification. The Boc protecting group ensures selective reactivity, as it can be removed under mild acidic conditions to expose the hydrazide for further conjugation. Applications include drug delivery systems, surface functionalization, and the development of bioconjugates for diagnostic or therapeutic purposes. Its versatility makes it a useful tool in research involving biomolecule modification and targeted delivery strategies.