2-Hydroxy atorvastatin lactone is primarily used as an intermediate in the synthesis of atorvastatin, a widely prescribed medication for lowering cholesterol levels. Its role is crucial in the pharmaceutical manufacturing process, ensuring the production of high-quality atorvastatin. Additionally, it is utilized in research and development to study the metabolic pathways and mechanisms of statin drugs, aiding in the improvement of therapeutic efficacy and safety. This compound also serves as a reference standard in analytical testing to ensure the purity and consistency of atorvastatin-based medications.