1-(2,5-Dideoxy-2-fluoro-.beta.-D-arabinofuranosyl)-5-iodocytosine 105309-31-7 4-Amino-1-((2R,3S,4R,5R)-3-fluoro-4-hydroxy-5-methyl-tetrahydro-furan-2-yl)-5-iodo-1H-pyrimidin-2-one 5'-deoxy-FIAC AIDS-191187 AIDS191187