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tert-butyl 2-((4R,6S)-6-((E)-2-(4-(4-fluorophenyl)-6-isopropyl-2-(N-methylmethylsulfonamido)pyrimidin-5-yl)vinyl)-2,2-dimethyl-1,3-dioxan-4-yl)acetate; CAS No.: 289042-12-2; This dienyl dioxane acetate exemplifies ChemShuttle s key intermediates for conjugated diene statins. The tert-butyl ester and E-configuration ensure proper spatial arrangement for enzyme binding. Our Heck coupling methodology achieves >98% stereoselectivity in vinyl group installation. The product enables efficient synthesis of rosuvastatin analogs with modified hydrophobic domains.