AIDS-153186 AIDS153186 NSC699333 [[3,4-Bis-(tert-butyl-dimethyl-silanyloxy)-5-(2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-2-yl]-(hydroxy-methyl-amino)-methyl]-phosphonic acid diethyl ester