2,4(1H,3H)-Pyrimidinedione, 1-[3-deoxy-2,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-3-[(5-methyl-1,2,4-oxadiazol-3-yl)methyl]-.beta.-L-ribofuranosyl]- AIDS-152706 AIDS152706 NSC697597