This chemical is widely used in bioconjugation and labeling applications due to its dual functional groups and fluorescent properties. The azide group enables click chemistry reactions, particularly with alkynes, making it valuable for attaching biomolecules like proteins, peptides, or nucleic acids. The PEG (polyethylene glycol) chains enhance solubility and reduce steric hindrance, improving efficiency in conjugation processes. The Cy5 fluorophore allows for fluorescence imaging and detection, making it useful in bioimaging, flow cytometry, and molecular tracking. Additionally, the carboxylic acid group provides a site for further modification or attachment to amine-containing molecules via EDC/NHS coupling. Its versatility makes it a key tool in drug delivery, diagnostics, and research applications.