1-((2R,3S,4R,5R)-5-Aminomethyl-3-fluoro-4-hydroxy-tetrahydro-furan-2-yl)-5-methyl-2,4(1H,3H)-pyrimidinedione 1-(5-amino-2,5-dideoxy-2-fluoro-.beta.-D-arabinofuranosyl)thymine 105281-14-9 5'-NH2-FMAU AIDS-191186 AIDS191186