Used as a fluorescent labeling reagent in bioimaging and analytical chemistry due to its strong electron-withdrawing properties and ability to enhance fluorescence when attached to biomolecules. Commonly applied in the detection of amines and thiols in biological samples. Also serves as a building block in the synthesis of heterocyclic compounds for pharmaceuticals and agrochemicals. Its nitro group allows further functionalization, making it valuable in the development of sensors and optoelectronic materials.