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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:isotopically modified compound
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Accession:CHEBI:139358 term browser browse the term
Definition:Any molecular entity in which the isotopic ratio of nuclides for at least one element deviates measurably from that occurring in nature. The term includes both isotopically substituted compounds (in which essentially all the molecules of the compound have only the indicated nuclide(s) at each designated position) and isotopically labeled compounds (a formal mixture of an isotopically unmodified compound with one or more analogous isotopically substituted compound(s).
Synonyms:related_synonym: isotopically modified compounds

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  CHEBI ontology 916
    chemical entity 916
      molecular entity 914
        isotopically modified compound 0
          ((18)O)water 0
          ((201)Tl)thallium monochloride 0
          (11)C-modified compound + 0
          (13)C-modified compound + 0
          (13)N-modified compound + 0
          (14)C-modified compound + 0
          (15)N-modified compound + 0
          (18)F radiopharmaceutical + 0
          (223)RaCl2 0
          chlormerodrin ((197)Hg) 0
          chlormerodrin ((203)Hg) 0
          deuterated compound + 0
          sodium 2-((125)I)iodohippurate 0
          sodium 2-((131)I)iodohippurate 0
          tritiated compound + 0
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