Acetic acid (4R,5S)-5-fluoro-2,6-dioxo-hexahydro-pyrimidin-4-yl ester

(5R,6R)-5-氟-6-羟基二氢-2,4(1H,3H)-嘧啶二酮

1,3-二甲基脲嘧啶

1-甲基尿嘧啶

3-甲基尿嘧啶