4-cyclohexyloxy-5-fluoro-2,6-dioxo-hexahydro-pyrimidine-5-carboxylic acid methyl ester
4-benzoyloxy-5-fluoro-2,6-dioxo-hexahydro-pyrimidine-5-carboxylic acid methyl ester
methyl 5-fluoro-4-methoxy-2,6-dioxohexahydro-5-pyrimidinecarboxylate
4-cyclohexylideneaminooxy-5-fluoro-2,6-dioxo-hexahydro-pyrimidine-5-carboxylic acid methyl ester
5-fluorouracil