Pharmacognosy - medicinal plants (herbs)

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Theme XVIII: Heterocycles

Pyrimidine. Pyrimidine ring.

Pyrimidine. Study of the pyrimidine ring. Biological significance of the pyrimidine bases: uracil, cytosine and thymine.

The diazines are structures containing two nitrogen atoms in its hexagonal ring. The pyrimidine is the o, p - Diazine and is the most important compound of this chemical group.

The pyrimidine ring appears in a wide variety of compounds which play a fundamental role in the biological process and is contained in vitamins, coenzymes, nucleotides, nucleic acid, etc.


Pyrimidine has aromatic characteristics and its nitrogen atoms give it basicity.

Among the natural pyrimidines structures are uracil, cytosine and thymine.

           Uracil                              Cytosine                              Thymine

These three pyrimidine bases appear in the carbon chains of nucleic acids which are essential constituents of all cells.

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