2,4(1H,3H)-Pyrimidinedione, 1-[3-deoxy-5-O-[(1,1-dimethylethyl)dimethylsilyl]-3-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methylamino]-2-Se-phenyl-2-selenopentofuranosyl]-5-methyl- AIDS-146683 AIDS146683 NSC674469