Pyrimidine wani samfurin heterocyclic ne mai kama da pyridine. Ɗaya daga cikin diazines guda uku (ƙwayoyin heterocyclics shida tare da nitrogen biyu a cikin zobe), yana da maharan nitrogen a wurare 1 da 3 a cikin zobe .:250 Sauran diazines sune pyrazine (nau'in nitrogen a cikin 1 da 4 matsayi) da pyridazine (nau'in nitrogen a cikin 1 da 2 matsayi). A cikin kwayoyin nucleic acid, nau'o'in nucleobases guda uku sune abubuwan da suka shafi pyrimidine: cytosine (C), thymine (T), da uracil (U).

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