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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 20056
        role 20008
          chemical role 19544
            oxidising agent 10020
              dioxygen 3571
                singlet dioxygen 0
                triplet dioxygen 0
    Path 2
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      CHEBI ontology 20056
        subatomic particle 20054
          composite particle 20054
            hadron 20054
              baryon 20054
                nucleon 20054
                  atomic nucleus 20054
                    atom 20054
                      main group element atom 19956
                        p-block element atom 19956
                          chalcogen 19693
                            oxygen atom 19666
                              oxygen molecular entity 19666
                                elemental oxygen 5836
                                  diatomic oxygen 3599
                                    dioxygen 3571
                                      singlet dioxygen 0
                                      triplet dioxygen 0
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