Actually, for the task described, it's perfect. It can take any
subset, but I was hesitant to suggest it as it doesn't give the same
results as subsetting the molecule (e.g. you can have a portion of an
aromatic ring).

- Noel

On 19 June 2017 at 16:07, Geoffrey Hutchison <geoff.hutchi...@gmail.com> wrote:
>> If it's a disconnected portion of the molecule, and you wanted to
>> write a smiles, there is a fragment option for the smiles writer that
>> you could use.
>
> It doesn't have to be a disconnected portion. That feature to the SMILES 
> writer will take a bit mask for the fragment -- it can be any combination of 
> atoms as a mask onto the OBMol.
>
> -Geoff
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