(3S,5R)-Rosuvastatin is a chiral synthetic intermediate and active pharmaceutical ingredient (API) precursor in the statin class, primarily used in pharmaceutical research, drug synthesis, and development for lipid-lowering medications. It acts as a potent inhibitor of HMG-CoA reductase, the rate-limiting enzyme in cholesterol biosynthesis, making it valuable for studying cholesterol metabolism, cardiovascular pharmacology, and formulating rosuvastatin-based therapies. This high-purity (≥95%) form is suitable for laboratory applications, including organic synthesis, biochemical assays, and quality control in pharmaceutical manufacturing. It is not intended for direct clinical use but supports the production of treatments for hypercholesterolemia, dyslipidemia, and related cardiovascular conditions. Handle with care, following safety protocols for organic compounds.