(-)-(2R,5S)-1-[2-(Hydroxymethyl)-1,3-oxathiolan-5-yl]uracil 145986-11-4 2,4(1H,3H)-Pyrimidinedione, 5-fluoro-1-[2-(hydroxymethyl)-1,3-oxathiolan-5-yl]-, (2R-cis)- AIDS-004772 AIDS004772 Oxathiolan 5FU-.b.