Used in bioimaging and targeted photodynamic therapy due to its near-infrared fluorescence and ability to bind to biomolecules. Commonly employed in real-time surgical imaging to visualize tumor margins and lymph nodes. Also utilized in drug delivery systems where it acts as a tracking agent for nanoparticle-based carriers. Its reactive group allows conjugation to proteins, antibodies, or other targeting moieties, enhancing specificity in diagnostic and therapeutic applications.