Used primarily as a reference standard or impurity marker in the pharmaceutical industry for quality control and analytical testing of vonoprazan, a potassium-competitive acid blocker (P-CAB) used in the treatment of gastroesophageal reflux disease (GERD) and other acid-related disorders. It helps in the identification, quantification, and monitoring of impurities during the synthesis, stability testing, and manufacturing of vonoprazan active pharmaceutical ingredient (API). Its presence is closely analyzed to ensure drug purity, safety, and regulatory compliance.