(2R,4R)-9-(2-(Hydroxymethyl)-3-methylene-2,3,4,5-tetrahydro-4-furanyl)-1,9-dihydropurin-6-one AIDS-081176 AIDS081176 L-Threo-pentitol, 1,4-anhydro-2,3-dideoxy-2-(6-hydroxy-9H-purin-9-yl)-3-methylene-