Used as an intermediate in the synthesis of proton pump inhibitors such as omeprazole and esomeprazole, which are widely prescribed for treating gastric acid-related disorders including gastroesophageal reflux disease (GERD) and peptic ulcers. Its structure allows for efficient coupling reactions in the formation of benzimidazole derivatives, making it valuable in pharmaceutical manufacturing. The hydrochloride salt form enhances stability and solubility during synthesis steps. Commonly employed in multi-step organic transformations under controlled conditions to ensure high yield and purity of the final active pharmaceutical ingredients.