The difference between Diazine and Pyrimidine
When used as nouns, diazine means any six-membered aromatic heterocycle containing four carbon atoms, two nitrogen atoms and three double bonds, whereas pyrimidine means a diazine in which the two nitrogen atoms are in the meta- positions.
check bellow for the other definitions of Diazine and Pyrimidine
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Diazine as a noun (organic compound):
Any six-membered aromatic heterocycle containing four carbon atoms, two nitrogen atoms and three double bonds
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Pyrimidine as a noun (organic compound):
A diazine in which the two nitrogen atoms are in the meta- positions; it is the basis of three of the bases found in DNA and RNA: thymine, uracil and cytosine