Isotopocule

Isotopocules are isotopically substituted molecules, which differ only in their isotopic composition or their isotopes' intramolecular position.

[1] "Isotopocule" is also an umbrella term for the more specific terms "isotopologue" and "isotopomer", coined by Jan Kaiser and Thomas Röckmann in 2008.

[2][3]

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Example of six stable isotopocules of ethanol (i.e. with stable isotopes ) out of the total number of 288 stable isotopocules