product description： Pharmaceutical secondary standards for application in quality control provide pharma laboratories and manufacturers with a convenient and cost-effective alternative to the preparation of in-house working standards. Omeprazole Impurity C is found to be as an impurity of omeprazole. Omeprazole is a benzimidazole derivative, which is widely used as an antiulcer drug and against other acid-related diseases. application： Olmesartan medoxomil may be used as a pharmaceutical secondary standard for the determination of the analyte in pharmaceutical formulations using different analytical techniques.These Secondary Standards are qualified as Certified Reference Materials. These are suitable for use in several analytical applications including but not limited to pharma release testing, pharma method development for qualitative and quantitative analyses, food and beverage quality control testing, and other calibration requirements.