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(2R,5S)-5-(4-amino-5-fluoro-2-oxo-1(2H)-pyrimidinyl)-1,3-oxathiolane-2-carboxylic acid (1R,2S,5R)-5-methyl-2-(1-methylethyl)cyclohexyl ester; CAS No.: 764659-72-5; This oxathiolane carboxylate exemplifies ChemShuttle s heterocycles expertise for antiviral nucleoside analogs. The (2R,5S) configuration mimics natural ribose stereochemistry. Our enzymatic desymmetrization achieves >99% ee in oxathiolane formation. The menthyl ester enhances crystallinity for purification, supporting development of hepatitis B virus reverse transcriptase inhibitors.