Sofosbuvir Impurity G is primarily used in the pharmaceutical industry for research and development purposes. It serves as a reference standard in the quality control and analytical testing of Sofosbuvir, an antiviral medication used to treat hepatitis C. By identifying and quantifying this impurity, manufacturers ensure the purity, safety, and efficacy of the drug. It is also utilized in stability studies to understand the degradation profile of Sofosbuvir under various conditions. Additionally, it aids in regulatory compliance by helping meet the stringent guidelines set by health authorities for impurity levels in pharmaceutical products.