2341-22-2 4-Amino-1-((2S,3S,4R,5S)-3,4-dihydroxy-5-hydroxymethyl-tetrahydro-furan-2-yl)-5-fluoro-1-H-pyrimidin-2-one AIDS-026298 AIDS026298 L-.beta.-Ribofuranosyl-5-fluoro-cytosine L-5-Fluorocytidine