Not sure what you're acting exactly. You can specify isotopes in smiles (
http://daylight.com/dayhtml/doc/theory/theory.smiles.html ).

If you want images of the structures that show what is an isotope, you can
compare the images produced by these two commands.
$ obabel -:C[14C]C[14C] -O isotope.png
$ obabel -:CCCC -O noisotope.png

-David



On Tue, Feb 25, 2014 at 12:53 PM, Shamal A Mehta <sme...@ebiochemica.com>wrote:

>  Is there a way to generate structures of radiolabelled compounds where
> once can clearly delineate the radiolabelled atom using Open Babel via
> Inchi, Smiles, Ismiles or Csmiles. Any help would be appreciated
>
>
>
>
>
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>
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>
>
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