(5S,6R)-5,6-dihydroxy-1,3-diazinane-2,4-dione

4-amino-1-(4-hydroxybut-2-ynyl)pyrimidin-2-one

4-amino-1-[(E)-4-chlorobut-2-enyl]pyrimidin-2-one

5,5-二溴-6-羟基二氢-2,4(1H,3H)-嘧啶二酮