Sofosbuvir Impurity A is primarily used in the pharmaceutical industry for quality control and regulatory compliance purposes. It serves as a reference standard to identify and quantify impurities in sofosbuvir, an antiviral medication used to treat hepatitis C. By ensuring the impurity levels are within acceptable limits, it helps maintain the safety, efficacy, and consistency of the drug. Additionally, it aids in the development and validation of analytical methods, ensuring accurate detection and measurement of impurities during the manufacturing process. This supports adherence to strict regulatory guidelines and enhances the overall quality of the final pharmaceutical product.