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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 24845
    chemical entity 24815
      atom 24805
        nonmetal atom 24544
          oxygen atom 23700
            oxygen-18 atom 0
              ((18)O)water 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 24845
    subatomic particle 24805
      composite particle 24805
        hadron 24805
          baryon 24805
            nucleon 24805
              atomic nucleus 24805
                atom 24805
                  main group element atom 24674
                    p-block element atom 24674
                      chalcogen 23815
                        oxygen atom 23700
                          oxygen-18 atom 0
                            ((18)O)water 0
paths to the root