甲醇

4-acetoxy-5-fluoro-2,6-dioxo-hexahydro-pyrimidine-5-carboxylic acid methyl ester

三氟甲基次氟酸酯

1,2,3,4-四氢-2,4-二氧代-5-嘧啶羧酸甲酯

5-fluoro-6-hydroxy-5-methoxycarbonyl-5,6-dihydrouracil