(+/-)cis-2'-Uracil-1-ylmethyl-4'-hydroxymethyl-1',3'- dioxolane 1-((4-(Hydroxymethyl)-1,3-dioxolan-2-yl)methyl)-2,4(1H,3H)-pyrimidinedione AIDS-160836 AIDS160836 NSC653486 NSC653487