Sulfo-KMUS is widely used in biochemical and biophysical research as a fluorescent labeling reagent. It is particularly effective for tagging proteins, peptides, and other biomolecules due to its water solubility and reactive succinimidyl ester group, which forms stable amide bonds with primary amines. This property makes it valuable in fluorescence microscopy, flow cytometry, and other imaging techniques to study cellular processes and molecular interactions. Additionally, its sulfonate group enhances solubility in aqueous solutions, ensuring efficient labeling in biological systems. Sulfo-KMUS is also employed in drug discovery and development for tracking drug-target interactions and evaluating pharmacokinetics. Its high sensitivity and specificity make it a preferred choice for researchers studying protein dynamics, localization, and function in live cells or complex biological samples.