I-Pyrimidine iyinxalenye ye-heterocyclic organic compound efana ne-pyridine. Enye yeentetho ezintathu (ii-heterocyclics ezinamathandathu ezinama-atom e-nitrojeni e-ring), ine-athomu ye-nitrogen kwiindawo ze-1 kunye ne-3 kwi-ring .:250 Ezinye iindidi zi-pyrazine (i-atrojeni ze-nitrogen kwi-1 ne-4) kunye ne-pyridazine (i-atrojeni ze-nitrogen kwi-1 kunye ne-2). Kwi-nucleic acids, iintlobo ezintathu ze-nucleobases ziyimveliso ye-pyrimidine: i-cytosine (C), i-thymine (T) kunye ne-uracil (U).

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