1-((2R,3S,4R,5R)-3-Fluoro-4-hydroxy-5-methyl-tetrahydro-furan-2-yl)-5-methyl-2,4(1H,3H)-pyrimidinedione 1-(2,5-Dideoxy-2-fluoro-.beta.-D-arabinofuranosyl)thymine 105281-06-9 5'-deoxy-FMAU AIDS-191189 AIDS191189