Used primarily as a photoactivatable crosslinking agent in biochemical and molecular biology research. The diazirine group generates highly reactive carbenes upon exposure to UV light, enabling covalent bonding with nearby molecules. This property makes it valuable for studying protein–protein, protein–nucleic acid, and ligand–receptor interactions through photoaffinity labeling. The tosylate group acts as a good leaving group, allowing for further functionalization or conjugation with nucleophiles such as amines or thiols in synthetic pathways. Its alkyne handle permits click chemistry modifications, facilitating detection or immobilization via azide-alkyne cycloaddition. Commonly employed in probe design for mass spectrometry, imaging, and target identification in complex biological systems.