(-)-(2R,5S)-5-Methyl-1-[2-(hydroxymethyl)-1,3-oxathiolan-5-yl]cystosine 145986-24-9 2(1H)-Pyrimidinone, 4-amino-1-[2-(hydroxymethyl)-1,3-oxathiolan-5-yl]-5-methyl-, (2R-cis)- AIDS-004780 AIDS004780 Oxathiolan 5MeC-.b.