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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.

Term:deuterium atom
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Accession:CHEBI:29237 term browser browse the term
Definition:The stable isotope of hydrogen with relative atomic mass 2.014102 and a natural abundance of 0.0115 atom percent (from Greek deltaepsilonupsilontauepsilonrhoomicronnu, second).
Synonyms:related_synonym: (2)1H;   (2)H;   D;   Deuterium;   Formula=D;   InChI=1S/H2/h1H/i1+1;   InChIKey=UFHFLCQGNIYNRP-OUBTZVSYSA-N;   SMILES=[2H];   deuterio;   heavy hydrogen;   hidrogeno pesado;   hydrogen-2;   schwerer Wasserstoff

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Path 1
Term Annotations click to browse term
  CHEBI ontology 25186
    chemical entity 25158
      molecular entity 25128
        inorganic molecular entity 24383
          hydrogen atom 23887
            deuterium atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 25186
    subatomic particle 25149
      composite particle 25149
        hadron 25149
          baryon 25149
            nucleon 25149
              atomic nucleus 25149
                atom 25149
                  main group element atom 25030
                    main group molecular entity 25030
                      s-block molecular entity 24298
                        hydrogen molecular entity 23887
                          elemental hydrogen 16
                            monoatomic hydrogen 0
                              hydron 0
                                deuteron 0
                                  deuterium atom 0
paths to the root