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The Chemical Entities of Biological Interest (ChEBI) ontology is downloaded weekly from EMBL-EBI at The data is made available under the Creative Commons License (CC BY 3.0, For more information see: Degtyarenko et al. (2008) ChEBI: a database and ontology for chemical entities of biological interest. Nucleic Acids Res. 36, D344–D350.

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Accession:CHEBI:16898 term browser browse the term
Definition:The parent compound of the pyrimidines; a diazine having the two nitrogens at the 1- and 3-positions.
Synonyms:related_synonym: 1,3-Diazin;   1,3-Diazine;   Formula=C4H4N2;   InChI=1S/C4H4N2/c1-2-5-4-6-3-1/h1-4H;   InChIKey=CZPWVGJYEJSRLH-UHFFFAOYSA-N;   Metadiazine;   Pyrimidin;   Pyrimidine base;   SMILES=c1cncnc1;   m-diazine
 alt_id: CHEBI:14982;   CHEBI:44847;   CHEBI:8675
 xref: Beilstein:103894;   CAS:289-95-2;   Gmelin:49324;   KEGG:C00396
 xref_mesh: MESH:C030986
 xref: PDBeChem:P1R;   PMID:8070089

show annotations for term's descendants           Sort by:
pyrimidine term browser
Symbol Object Name Qualifiers Evidence Notes Source PubMed Reference(s) RGD Reference(s) Position
G RGD1564865 similar to 20-alpha-hydroxysteroid dehydrogenase decreases activity ISO pyrimidine analog results in decreased activity of AKR1C1 protein CTD PMID:19007763 NCBI chr17:69,468,427...69,497,132
Ensembl chr17:69,468,427...69,497,132
JBrowse link
G Upp1 uridine phosphorylase 1 increases metabolic processing ISO UPP1 protein results in increased metabolism of pyrimidine CTD PMID:15772079 NCBI chr14:89,314,234...89,334,060
Ensembl chr14:89,314,176...89,334,276
JBrowse link

Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 19817
    chemical entity 19817
      molecular entity 19814
        mancude ring 8134
          organic mancude parent 8134
            mancude organic heterocyclic parent 8134
              mancude organic heteromonocyclic parent 4635
                diazine 2
                  pyrimidine 2
Path 2
Term Annotations click to browse term
  CHEBI ontology 19817
    subatomic particle 19815
      composite particle 19815
        hadron 19815
          baryon 19815
            nucleon 19815
              atomic nucleus 19815
                atom 19815
                  main group element atom 19705
                    p-block element atom 19705
                      carbon group element atom 19614
                        carbon atom 19603
                          organic molecular entity 19603
                            organic molecule 19532
                              organic cyclic compound 19348
                                organic heterocyclic compound 18475
                                  organic heteromonocyclic compound 16598
                                    mancude organic heteromonocyclic parent 4635
                                      diazine 2
                                        pyrimidine 2
paths to the root