Cytosine
5-Fluorocytosine
5-Fluouracil
Formamidine Acetate
Maleimide
Meldrum’s Acid
2-Chloro-4-amino-5-fluoropyrimidine
2,4-Dichloro-5-fluoropyrimidine
2-Methoxy-5-fluorouracil
2-Ethoxy-5-fluorouracil
4-Ethyl-5-fluoro-6-hydroxypyrimidine
