Send us a Message

Submit Data |  Help |  Video Tutorials |  News |  Publications |  Download |  REST API |  Citing RGD |  Contact   


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.

go back to main search page
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

show annotations for term's descendants           Sort by:

Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 20072
    chemical entity 20071
      molecular entity 20071
        isotopically modified compound 1
          ((18)O)water 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 20072
    subatomic particle 20071
      composite particle 20071
        hadron 20071
          baryon 20071
            nucleon 20071
              atomic nucleus 20071
                atom 20071
                  main group element atom 19974
                    main group molecular entity 19974
                      s-block molecular entity 19774
                        hydrogen molecular entity 19766
                          hydrides 19135
                            inorganic hydride 17930
                              chalcogen hydride 2554
                                oxygen hydride 777
                                  water 716
                                    ((18)O)water 0
paths to the root