(+)-(1'S,2'R,3'S)-1-(2,3-Dihydroxy-4-hydroxymethylcyclopent-1-enyl)-5-methyl-(1H,3H)-pyrimidine-2,4-dione (+)-(1'S,2'R,3'S)-1-[2,3-Dihydroxy-4-hydroxymethyl-4-cylopenten-1-yl]thymine AIDS-114033 AIDS114033 Neplanocin Analog