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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:33813 term browser browse the term
Definition:A form of water consisting of two hydrogen atoms covalently bonded to an oxygen-18 atom.
Synonyms:related_synonym: (18)OH2;   Formula=H2[18O];   H2(18)O;   InChI=1S/H2O/h1H2/i1+2;   InChIKey=XLYOFNOQVPJJNP-NJFSPNSNSA-N;   SMILES=[H][18O][H];   heavy-oxygen water
 xref: CAS:14314-42-2;   Gmelin:130;   PMID:24711961

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Path 1
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  CHEBI ontology 19831
    chemical entity 19829
      molecular entity 19829
        isotopically modified compound 7
          ((18)O)water 0
Path 2
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  CHEBI ontology 19831
    subatomic particle 19829
      composite particle 19829
        hadron 19829
          baryon 19829
            nucleon 19829
              atomic nucleus 19829
                atom 19829
                  main group element atom 19779
                    main group molecular entity 19779
                      s-block molecular entity 19617
                        hydrogen molecular entity 19604
                          hydrides 19102
                            inorganic hydride 18114
                              chalcogen hydride 2572
                                oxygen hydride 800
                                  water 739
                                    ((18)O)water 0
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