Used in bioconjugation and labeling applications, it serves as a versatile linker for attaching fluorescent dyes like Cy5 to biomolecules such as proteins, peptides, or nucleic acids. The azide group enables click chemistry reactions, particularly with alkyne-functionalized molecules, while the PEG3 spacers enhance solubility and reduce steric hindrance. This compound is valuable in fluorescence imaging, flow cytometry, and molecular tracking studies, providing precise and stable labeling for biological research and diagnostics. Its dual-functional design allows for efficient and specific modifications in complex biological systems.