An isomer that differs in the position of its isotopic substitutions. The three isotopomers of C2H5DO are shown below:

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

Isotopomers should not be confused with isotopologues.

http://www.iupac.org/goldbook/I03352.pdf

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