(-)-(2S,5S)-1-[2-(Hydroxymethyl)-1,3-oxathiolan-5-yl]uracil 149819-45-4 2,4(1H,3H)-Pyrimidinedione, 1-[2-(hydroxymethyl)-1,3-oxathiolan-5-yl]-, (2S-trans)- AIDS-005667 AIDS005667 OxathiolanU-(-).a.