Pyrimidine jẹ ẹya ara ẹni heterocyclic Organic iru bi pyridine. Ọkan ninu awọn diazines mẹta (awọn heterocyclici mẹfa-membered pẹlu awọn atokuro nitrogen meji ninu iwọn), o ni awọn ẹmu nitrogen ni awọn ipo 1 ati 3 ninu oruka .:250 Awọn ẹda miiran jẹ pyrazine (awọn ọna nitrogen ni ipo 1 ati 4) ati pyridazine (awọn aami nitrogen ni ipo 1 ati 2). Ninu awọn ohun elo ti nucleic, awọn oriṣi mẹta ti awọn nucleobases jẹ awọn itọsẹ pyrimidine: cytosine (C), thymine (T), ati Uracil (U).

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