Dicyclopenta[d,j][1,3,7,9,2,8]tetraoxadiphosphacyclododecin-3-ol, 2,9-bis(6-amino-9H-purin-9-yl)-10-fluorododecahydro-5,12-dihydroxy-, 5,12-dioxide, (2R,3S,3aR,7aR,9R,10S,10aR,14aR)-