Azido-PEG2-hydrazide-Boc is widely used in bioconjugation and chemical synthesis due to its unique functional groups. The azide group allows for efficient click chemistry reactions, particularly copper-catalyzed azide-alkyne cycloaddition (CuAAC), enabling the attachment of molecules to biomolecules like proteins, peptides, or nucleic acids. The hydrazide group is reactive toward carbonyl compounds, making it useful for labeling or modifying aldehydes and ketones in biomolecules. The Boc (tert-butoxycarbonyl) group serves as a protective group for amines, ensuring selective reactions in multi-step syntheses. This compound is particularly valuable in drug development, biopolymer modification, and the creation of targeted delivery systems, where precise and controlled conjugation is essential. Its PEG (polyethylene glycol) spacer enhances solubility and reduces steric hindrance during reactions.