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CHEBI ONTOLOGY - ANNOTATIONS

The Chemical Entities of Biological Interest (ChEBI) ontology is downloaded weekly from EMBL-EBI at http://www.ebi.ac.uk/chebi/. The data is made available under the Creative Commons License (CC BY 3.0, http://creativecommons.org/licenses/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.

Term:oxygen-18 atom
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Accession:CHEBI:33815 term browser browse the term
Definition:The stable isotope of oxygen with relative atomic mass 17.999160 and 0.205 atom percent natural abundance.
Synonyms:related_synonym: (18)8O;   (18)O;   Formula=[18O];   InChI=1S/O/i1+2;   InChIKey=QVGXLLKOCUKJST-NJFSPNSNSA-N;   SMILES=[18O];   heavy oxygen;   oxygen, isotope of mass 18;   oxygen-18;   schwerer Sauerstoff
 xref: CAS:14797-71-8;   Gmelin:17562



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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 19911
    chemical entity 19909
      atom 19909
        nonmetal atom 19845
          oxygen atom 19579
            oxygen-18 atom 0
              ((18)O)water 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19911
    subatomic particle 19909
      composite particle 19909
        hadron 19909
          baryon 19909
            nucleon 19909
              atomic nucleus 19909
                atom 19909
                  main group element atom 19859
                    p-block element atom 19859
                      chalcogen 19605
                        oxygen atom 19579
                          oxygen-18 atom 0
                            ((18)O)water 0
paths to the root