Used primarily as a reference standard in pharmaceutical quality control and analytical testing during the manufacturing and purification of ivabradine, a medication for treating chronic heart failure and angina. Helps in identifying and quantifying impurities in final drug products to ensure safety and compliance with regulatory standards. Also utilized in stability studies to monitor degradation products under various storage conditions. Plays a critical role in method development and validation of chromatographic techniques like HPLC and LC-MS for accurate detection of related substances in ivabradine formulations.