1-(5-Hydroxy-6-methyl-5,6-dihydro-2H-pyran-2-yl)-5-(trifluoromethyl)-2,4(1H,3H)-pyrimidinedione 5-Trifluoromethyl-1-(2,3,6-trideoxy-.alpha.-L-erythro- hex-2-enopyranosyl)uracil AIDS-135273 AIDS135273 NSC634680