A molecule with a different set of isotopes in it. Some isopotologues of C2H5OH are shown below:

    H H           H H         H D
    | |           | |         | |
  H-C-C-O-D     D-C-C-O-D   D-C-C-O-H
    | |           | |         | |
    H H           H H         D H

Isotopologues should not be confused with isotopomers.

http://www.iupac.org/goldbook/I03351.pdf

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