2,4(1H,3H)-Pyrimidinedione, 1-(2-deoxy-b-D-erythro-pentofuranosyl)-5-methyl- and 2(1H)-Pyrimidinone, 1-(2-deoxy-b-D-erythro-pentofuranosyl)-4-hydroxy-5-(2-propenyl)- AIDS-212444 AIDS212444