(-)-(2S,5S)-5-Fluoro-1-[2-(hydroxymethyl)-1,3-oxathiolan-5-yl]cystosine 145416-34-8 2(1H)-Pyrimidinone, 4-amino-5-fluoro-1-[2-(hydroxymethyl)-1,3-oxathiolan-5-yl]-, (2S-trans)- AIDS-005681 AIDS005681 Oxathiolan, 5FC-(-).a.