(-)-9-[(1S,4R)-2,3-Dideoxy-2,3-didehydro-2-fluoro-4-thio-beta-L-ribofuranosyl]hypoxanthine 9-(3-Fluoro-5-hydroxymethyl-2,5-dihydro-thiophen-2-yl)-9H-purin-6-ol AIDS-163231 AIDS163231