Widely used in bioimaging and fluorescence labeling, this compound enables highly sensitive detection in live and fixed cells due to its near-infrared emission, which reduces background autofluorescence and increases tissue penetration depth. Its azide group allows for efficient click chemistry conjugation with alkynes, making it ideal for labeling biomolecules such as proteins, nucleic acids, and glycans in complex biological systems. Commonly applied in flow cytometry, confocal microscopy, and in vivo imaging, it supports research in cancer biology, immunology, and drug delivery. The sulfonate groups enhance water solubility and reduce nonspecific binding, improving signal-to-noise ratio in assays.