Used primarily as a reference standard in pharmaceutical quality control and analytical testing during the synthesis and purification of vortioxetine, an antidepressant medication. It helps in identifying and quantifying impurities in drug substances and formulations to ensure product safety and compliance with regulatory requirements. Commonly employed in high-performance liquid chromatography (HPLC) and mass spectrometry (MS) for method development and validation. Also useful in stability studies to monitor degradation pathways and assess shelf life of vortioxetine-based products.