Used in bioimaging and fluorescence-based diagnostics due to its near-infrared emission, allowing deep tissue penetration with low background autofluorescence. Commonly employed in labeling proteins, antibodies, and nanoparticles for in vivo imaging, tumor detection, and lymph node mapping. Also utilized in photothermal therapy and as a tracer in ophthalmic angiography. Its amine group enables easy conjugation to biomolecules, making it valuable in research and clinical applications involving targeted imaging and therapeutic delivery.