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Rosuvastatin tert-Butyl Ester; (3R,5S,E)-tert-butyl 7-(4-(4-fluorophenyl)-6-isopropyl-2-(N-methylmethylsulfonamido)pyrimidin-5-yl)-3,5-dihydroxyhept-6-enoate; CAS No.: 355806-00-7; ChemShuttle provides pharma building blocks like this tert-butyl dihydroxyheptenoate, featuring critical statin pharmacophore elements. The (3R,5S,E) configuration mimics the natural mevalonate substrate. Our enzymatic desymmetrization process achieves >99% enantiomeric excess in diol formation. The product supports structure-based design of HMG-CoA reductase inhibitors with improved metabolic stability.