2,4(1H,3H)-Pyrimidinedione, 1-[2,3-dideoxy-3-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)-5-O-[(1,1-dimethylethyl)dimethylsilyl]-.beta.-L-erythro-pentofuranosyl]-5-methyl- AIDS-153184 AIDS153184 NSC699331