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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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    Path 1
    Term Annotations click to browse term
      CHEBI ontology 19876
        role 19851
          chemical role 19472
            oxidising agent 11914
              dioxygen 3992
                singlet dioxygen 0
                triplet dioxygen 0
    Path 2
    Term Annotations click to browse term
      CHEBI ontology 19876
        subatomic particle 19874
          composite particle 19874
            hadron 19874
              baryon 19874
                nucleon 19874
                  atomic nucleus 19905
                    atom 19905
                      main group element atom 19821
                        p-block element atom 19821
                          chalcogen 19570
                            oxygen atom 19543
                              oxygen molecular entity 19543
                                elemental oxygen 8970
                                  diatomic oxygen 4020
                                    dioxygen 3992
                                      singlet dioxygen 0
                                      triplet dioxygen 0
    paths to the root