Used primarily as a photoactivatable crosslinking agent in biochemical and molecular biology research. Its main application lies in studying protein-protein interactions, protein-ligand binding, and mapping interaction sites within complex biological systems. Upon exposure to UV light, the diazirine group generates highly reactive carbenes that form covalent bonds with nearby molecules, effectively "capturing" transient or weak interactions. The NHS ester group enables efficient conjugation to primary amines on proteins or other biomolecules, while the sulfonate group enhances water solubility, making it suitable for use in aqueous biological environments. This compound is especially valuable in proteomics for identifying binding partners and spatial relationships in multiprotein complexes.