6-azido-1,3-dimethyl-5-formyluracil

甲基肼

4-chloro-1,3-dimethyl-2,6-dioxopyrimidine-5-carbaldehyde

6-azido-1,3-dimethylpyrimidine-2,4-dione

1-methyl-6-sulfanylidene-2H-pyrazolo[3,4-d]pyrimidin-4-one