Used as a key intermediate in the synthesis of varenicline, a medication for smoking cessation. It plays a critical role in forming the core structure of varenicline, which acts as a partial agonist at α4β2 nicotinic acetylcholine receptors. This compound enables selective targeting of nicotine receptors, helping reduce withdrawal symptoms and cravings. Its functional groups allow for further chemical modifications essential in pharmaceutical development. Widely utilized in research and industrial settings for developing nicotinic receptor modulators.