(2R,4R)-1-(2-(Hydroxymethyl)-3-methylene-2,3,4,5-tetrahydro-4-furanyl)-1H-pyrimidine-2,4-dione AIDS-081178 AIDS081178 L-Threo-pentitol, 1,4-anhydro-2,3-dideoxy-2-(3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)-3-methylene-