Cy5diacid, SE is widely used in biomedical research for labeling biomolecules such as proteins, peptides, and nucleic acids. Its near-infrared fluorescence properties make it ideal for imaging and detection applications, particularly in fluorescence microscopy and flow cytometry. The compound is often employed in studying cellular processes, tracking molecular interactions, and developing diagnostic assays. Additionally, it is utilized in the synthesis of fluorescent probes for in vivo imaging, enabling non-invasive visualization of biological tissues and structures. Its stability and high sensitivity contribute to its effectiveness in advanced research and diagnostic techniques.