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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:15379 term browser browse the term
Definition:An elemental molecule that has formula O2.
Synonyms:related_synonym: Disauerstoff;   E-948;   E948;   Formula=O2;   InChI=1S/O2/c1-2;   InChIKey=MYMOFIZGZYHOMD-UHFFFAOYSA-N;   O2;   OXYGEN MOLECULE;   Oxygen;   SMILES=O=O;   [OO];   dioxygene;   molecular oxygen
 alt_id: CHEBI:10745;   CHEBI:13416;   CHEBI:23833;   CHEBI:25366;   CHEBI:30491;   CHEBI:44742;   CHEBI:7860
 xref: CAS:7782-44-7;   Gmelin:485;   HMDB:HMDB0001377;   KEGG:C00007;   KEGG:D00003
 xref_mesh: MESH:D010100
 xref: MetaCyc:OXYGEN-MOLECULE;   MolBase:750;   PDBeChem:OXY;   PMID:10906528;   PMID:16977326;   PMID:18210929;   PMID:18638417;   PMID:19840863;   PMID:7710549;   PMID:9463773;   Wikipedia:Oxygen
 cyclic_relationship: is_conjugate_base_of CHEBI:29793

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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 19816
    role 19764
      chemical role 19288
        oxidising agent 9266
          dioxygen 3515
            singlet dioxygen 0
            triplet dioxygen 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19816
    subatomic particle 19814
      composite particle 19814
        hadron 19814
          baryon 19814
            nucleon 19814
              atomic nucleus 19814
                atom 19814
                  main group element atom 19702
                    p-block element atom 19702
                      chalcogen 19399
                        oxygen atom 19361
                          oxygen molecular entity 19361
                            elemental oxygen 4403
                              diatomic oxygen 3545
                                dioxygen 3515
                                  singlet dioxygen 0
                                  triplet dioxygen 0
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