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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 21798
    chemical entity 21796
      molecular entity 21783
        inorganic molecular entity 21467
          hydrogen atom 21166
            deuterium atom 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 21798
    subatomic particle 21784
      composite particle 21784
        hadron 21784
          baryon 21784
            nucleon 21784
              atomic nucleus 21784
                atom 21784
                  main group element atom 21702
                    main group molecular entity 21702
                      s-block molecular entity 21229
                        hydrogen molecular entity 21166
                          elemental hydrogen 17
                            monoatomic hydrogen 0
                              hydron 0
                                deuteron 0
                                  deuterium atom 0
paths to the root