This chemical is widely used in bioconjugation and click chemistry applications due to its azide functional group, which allows for efficient and selective reactions with alkyne-containing compounds. It is particularly valuable in the modification of biomolecules, such as proteins, peptides, and antibodies, enabling the attachment of labels, probes, or other functional groups for research, diagnostics, or therapeutic purposes. The PEG (polyethylene glycol) spacer enhances solubility and reduces steric hindrance, improving the efficiency of the conjugation process. Additionally, its carboxylic acid group provides a site for further functionalization or coupling reactions, making it versatile in the development of drug delivery systems, bioconjugates, and biomaterials.