(2R,4R)-2-Amino-9-(2-(hydroxymethyl)-3-methylene-2,3,4,5-tetrahydro-4-furanyl)-1,9-dihydropurin-6-one AIDS-081177 AIDS081177 L-Threo-pentitol, 2-(2-amino-6-hydroxy-9H-purin-9-yl)-1,4-anhydro-2,3-dideoxy-3-methylene-