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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 5059
    chemical entity 5059
      atom 5050
        nonmetal atom 5011
          oxygen atom 4887
            oxygen-18 atom 0
              ((18)O)water 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 5059
    subatomic particle 5050
      composite particle 5050
        hadron 5050
          baryon 5050
            nucleon 5050
              atomic nucleus 5050
                atom 5050
                  main group element atom 5017
                    p-block element atom 5014
                      chalcogen 4920
                        oxygen atom 4887
                          oxygen-18 atom 0
                            ((18)O)water 0
paths to the root