Used as an analytical reagent for the detection and determination of primary aromatic amines, particularly in spectrophotometric methods. It forms colored Schiff base derivatives when reacted with amines, which can be measured quantitatively. Also employed in the synthesis of heterocyclic compounds and pharmaceutical intermediates due to its reactive aldehyde and nitro functional groups. Its structure makes it useful in coordination chemistry as a ligand precursor. Additionally, it serves as a building block in the preparation of dyes and sensors for metal ions.