Used as a key intermediate in the synthesis of varenicline, a medication for smoking cessation. It enables the construction of the core structure of varenicline through selective functionalization and coupling reactions. Its nitro group can be reduced to an amine, which is further modified to form the diazabicyclic ring system present in the final drug. Due to its structural specificity, it plays a critical role in ensuring the correct pharmacological profile of the active pharmaceutical ingredient. Commonly employed in research and development settings for nicotine receptor modulators.