2,4(1H,3H)-Pyrimidinedione, 1-[(2R,4S,5R)-5-ethynyltetrahydro-4-hydroxy-2-furanyl]-5-methyl- and 2,4(1H,3H)-Pyrimidinedione, 1-[(2R,5S)-5-(aminomethyl)tetrahydro-2-furanyl]-5-methyl- AIDS-196045 AIDS196045