2'-fluoro-5-methylarabinosyluracil [ 1-(2-fluoro-2-deoxy-beta-arabinofuranosyl)thymine,1-(2-fluoro-5-methyl-beta,L-arabinofuranosyl)uracil,2'-deoxy-2'-fluoroarabinofuranosylthymine,2'-fluoro-1-beta-arabinofuranosyl-5-methyluracil,2'-fluoro-5-methyl-1-beta-D-arabinofuranosyluracil,2'-fluoro-5-methyl-1-beta-arabinosyluracil,2'-fluoro-5-methylarabinosyluracil, 2-(14)C-labeled,Clevudine,FMAU,L-FMAU ] RN given refers to (D)-isomer