Olmesartan EP Impurity C is primarily used in the pharmaceutical industry for quality control and analytical purposes. It serves as a reference standard in the development and validation of analytical methods to ensure the purity and safety of Olmesartan, an active pharmaceutical ingredient used in antihypertensive medications. By identifying and quantifying this impurity, manufacturers can comply with regulatory requirements and maintain the efficacy of the drug. Its application is crucial in research and development labs to monitor and control impurities during the synthesis and production processes, ensuring the final product meets stringent quality standards.