different between pyrimidine vs pyrimidone

English

From German Pyrimidin [1885], from German Pyridin (“pyridine”), with the insertion of -mi- from amidine.

pyrimidine (plural pyrimidines)

(organic chemistry) 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

pyrimidone (countable and uncountable, plural pyrimidones)

(organic chemistry) Either of two heterocyclic compounds, with chemical formula C₄H₄N₂O, whose derivatives are the basis of many other biological molecules.

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