Pyrimidine ke monko o monko oa heterocyclic o sebetsang o tšoanang le pyridine. E 'ngoe ea tse ling tse tharo (li-heterocyclics tse nang le lihlopha tse tšeletseng tse nang le liathomo tse peli tsa naetrojene ka har'a lesale), li na le liathomo tsa naetrojene libakeng tsa 1 le 3 ka har'a reng .: 250 Tse ling tse diazines ke pyrazine (liathomo tsa naetrojene 1 le 4) le pyridazine (liathomo tsa naetrojene libakeng tsa 1 le 2). Nucleic acids, mefuta e meraro ea nucleobases ke li-derivatives tse tsoang ho pyrimidine: cytosine (C), thymine (T) le uracil (U).

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