1-(2,3-二硫代呋喃戊糖基)-2,4(1H,3H)-嘧啶二酮

1-(7-hydroxy-2,5-dioxabicyclo[2.2.1]heptan-3-yl)pyrimidine-2,4-dione

尿素

丙炔酸

5-碘-6-羟基-2-甲基硫代嘧啶