If you can describe the substructures by a SMARTS string, it's fairly
easy by customising FP4. Here's the output of FP4 for the arylbromide:

C:\Users\Noel>obabel -:c1(Br)ccc(Br)c1 -ofpt -xf fp4 -xs
>
Secondary_carbon        Alkylbromide
1 molecule converted

How to customise?...

C:\Users\Noel>obabel -L fp4
One of the fingerprints
fp4    SMARTS patterns specified in the file SMARTS_InteLigand.txt
PatternFP is definable

...edit SMARTS_InteLigand.txt or copy it to your current directory and
edit it then.

- Noel

On 8 December 2012 13:51, David van der Spoel <sp...@xray.bmc.uu.se> wrote:
> Hi,
>
> is it possible with openbabel to classify a molecule based on substructures?
>
> E.g.:
>
> 110-dichlorodecane.sdf
> alkyl chloride
>
> 11122334455666-tetradecafluorohexane.sdf
> alkyl fluoride
>
> 111-trimethoxyethane.sdf
> orthocarboxylic acid derivative
> orthoester
>
> 13-dibromobenzene.sdf
> aryl bromide
> aromatic compound
>
>
> --
> David van der Spoel, Ph.D., Professor of Biology
> Dept. of Cell & Molec. Biol., Uppsala University.
> Box 596, 75124 Uppsala, Sweden. Phone:  +46184714205.
> sp...@xray.bmc.uu.se    http://folding.bmc.uu.se
>
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