This compound is widely used in biochemical research and pharmaceutical development due to its unique properties. It is commonly employed as a fluorescent labeling agent for biomolecules, enabling visualization and tracking in various biological systems. The PEG (polyethylene glycol) chains enhance solubility and reduce immunogenicity, making it suitable for in vivo applications such as imaging and drug delivery. Its Cy5 fluorophore provides strong near-infrared fluorescence, which is ideal for deep-tissue imaging and multiplex assays. Researchers utilize this compound to study protein-protein interactions, cellular processes, and targeted drug delivery systems. Additionally, it is used in the development of diagnostic tools and therapeutic agents, particularly in cancer research and immunotherapy.