Used as an intermediate in the synthesis of pharmaceuticals, particularly in the production of antihypertensive and antiarrhythmic drugs. It plays a key role in the preparation of pyridine-based compounds due to its reactive chlorine and nitro groups, which allow for selective substitutions. Commonly employed in the development of agrochemicals and dyes, where its N-oxide functionality enhances reactivity and solubility in polar solvents. Also utilized in research for constructing nitrogen-containing heterocycles in medicinal chemistry.