John:

That's helpful, I appreciate your prompt response.

Thanks

Velusamy K. Velu
614-323-9649
<https://peruselab.com/>  <https://www.linkedin.com/in/vkvelu/>
<https://twitter.com/PeruseLab>  <https://www.facebook.com/PeruseLab/>


On Tue, Nov 7, 2023 at 10:42 AM John Mayfield <john.wilkinson...@gmail.com>
wrote:

> In CDK they are called Psuedo atoms. You can manually create from or load
> from an input.
>
> In SMILES you can do the following (CDK extension) [R1]CCCC. The more
> correct way in CXSMILES would be *CCCCC |$R1$|.
>
> On Mon, 6 Nov 2023 at 21:42, Velusamy Velu <vv...@peruselab.com> wrote:
>
>> Hi Friends:
>>
>> I want to know how the generic symbols like X for halogens, R, R', R''
>> and Me, Et, Pr, Ar and Ph (Methyl, Ethyl, Propyl, Aryls, & Phenyl) etc are
>> handled by CDK?
>>
>> Is there any good documentation in this regard? Your help is much
>> appreciated.
>>
>> Thanks
>>
>> Velusamy K. Velu
>> (614) 323-9649
>> <https://peruselab.com>  <https://www.linkedin.com/company/peruselab/>
>> <https://twitter.com/PeruseLab>  <https://www.facebook.com/PeruseLab/>
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