Hi,

On Thu, Mar 8, 2012 at 9:30 PM, Fouad Ballout <fouad.ball...@rub.de> wrote:
> Hi there,
>
> I have problems with generating conformers for a particular molecule using
> openbabel. Following the openbabel documentation I've used the following
> command line
>
> obabel input.xyz -O output.xyz --conformer --systematic --ff GAFF

The systematic conformer search only writes out the lowest energy conformer.

> in order to find all local stable conformers using GAFF but without success.
> The output just contains one structure. The same happens if I use a command
> line similar to that appearing in the documentation:
>
> obabel input.xyz -O output.xyz --conformer --nconf 50 --score energy

Using the genetic algorithm, it's possible to write out all 50
conformers if you add the --write-conformers parameter IIRC. Check the
babel -H help information to ensure it's the right parameter.

> What is wrong with these commands? By the way how does openbabel perform
> this systematic conformational search?

The systematic search is done by rotating all bonds and selecting the
lowest energy conformer.

> I would really appreciate it if
> someone could help me out with this.

Tim

> Best regards
> Fouad Ballout
>
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------------------------------------------------------------------------------
Virtualization & Cloud Management Using Capacity Planning
Cloud computing makes use of virtualization - but cloud computing 
also focuses on allowing computing to be delivered as a service.
http://www.accelacomm.com/jaw/sfnl/114/51521223/
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