Pyrimidine ndi mankhwala onunkhira otchedwa heterocyclic organic compound ofanana ndi pyridine. Chimodzi mwa zigawo zitatu (mahekitala asanu ndi atatu a mahekitala ndi ma atomu aŵiri a nayitrogeni mu mphete), ali ndi maatomu a nitrojeni pa maudindo 1 ndi 3 mu mphete .:250 Zina diazines ndi pyrazine (maatomu a nitrogen pa 1 ndi 4 malo) ndi pyridazine (maatomu a nitrojeni pa 1 ndi 2 malo). Mu nucleic acid, mitundu itatu ya nucleobases ndi mapiritsiidine: cytosine (C), thymine (T), ndi uracil (U).

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