Pyrimidine

Pyrimidines include three of the bases in DNA and RNA.

A pyrimidine is an aromatic heterocyclic organic compound, similar to purine. It has nitrogens at positions 1 and 3 in the ring.Brown H.C. et al 1955. In Baude, E.A. and Nachod, F.C., Determination of organic structures by physical methods. Academic Press, New York. 

 Pyrimidines 
The pyrimidine ring system occurs widely in nature.
Cytosine (C), 
Thymine (T), 
Uracil (U).
Thiamine (vitamin B1)

It is also found in many synthetic compounds such as barbiturates and the HIV drug, zidovudine. Uric acid is a pyrimidine derivative.  

 References 

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Category:Simple aromatic rings