Pyrimidine bụ aromatic heterocyclic organic compound yiri pyridine. Otu n'ime diazine atọ (mkpụrụ heterocyclic isii nke isii na nitrogen abụọ na mgbanaka ahụ), o nwere nitrogen ndị nọ n'ọnọdụ 1 na 3 na mgbanaka .:250 Ndị ọzọ diazine bụ pyrazine (amị nitrogen na ọnọdụ 1 na 4) na pyridazine (amịrị nitrogen na ọnọdụ 1 na 2). Na acids nucleic, ụdị atọ nke nucleobases bụ ihe ndị pyrimidine: cytosine (C), thymine (T), na uracil (U).

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