[ASAP] Synthesis and Anti-HCV Activities of 4`-Fluoro-2`-Substituted Uridine Triphosphates and Nucleotide Prodrugs: Discovery of 4`-Fluoro-2`-C-methyluridine 5`-Phosphoramidate Prodrug (AL-335) for the Treatment of Hepatitis C Infection (Journal of Medicinal Chemistry)