5-Fluoro-1-(2,3,6-trideoxy-.alpha.-L-erythro-hex- 2-enopyranosyl) uracil 5-Fluoro-1-(5-hydroxy-6-methyl-5,6-dihydro-2H-pyran-2-yl)-2,4(1H,3H)-pyrimidinedione AIDS-134480 AIDS134480 NSC632858