(4S,5R)-ethyl 5-((R)-2,2-diMethyl-1,3-dioxolan-4-yl)-4-Methyl-1,3,2-dioxathiolane-4-carboxylate 2,2-dioxide

2-C-Methyl-4,5-O-(1-methylethylidene)-D-arabinonic Acid?Ethyl Ester Cyclic Sulfate?can be?utilized for the synthesis of2''-deoxy-2''-fluoro-2''-C-methylcytidine (I) (PSI-6130), which is a potent and selective inhibitor of HCV NS5B polymerase. It also has potential applications for the synthesis of related antiviral agents.