AIDS-082151 AIDS082151 Thiophosphoric acid O-(5-{2-amino-6-[2-(4-nitro-phenyl)-ethoxy]-purin-9-yl}-3,4-dihydroxy-tetrahydro-furan-2-ylmethyl) ester O'-[5-(6-amino-purin-9-yl)-4-fluoro-2-hydroxymethyl-tetrahydro-furan-3-yl] ester