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From: "Tamas Gunda" <tamasgunda@tigris.klte.hu>
To: chemistry@ccl.net
Date: Thu, 12 Aug 1999 12:05:25 +1
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Subject: Re: CCL:software for preparing input file for large molecul
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> From:          Pradipta Bandyopadhyay <pradipta@si.fi.ameslab.gov>

>  Dear CCL members,
>     I have a question about the preparation of input file for large molecules.
>  It is hard to use z-matrix input for a large molecule. So I decided to use
>  some drawing software to draw the molecule and then extract the coordinates
>  using 'BABEL'. I have been using ISIS Draw 2.2.1. However, all structures
>  drawn by me are coming as planar  i.e. Z-coordinates are all zero. My
>  question is 
>      Am I making some mistake or is it intrinsic to ISIS?
>         and
>      is there any other software, which can do the things better?
>        and
>      what is the standard way of generating input file for a large molecule
>     (say, has 100 atoms) i.e. my way is correct or not?
>  Thanks for your help. I will summarize the replies.
>                                           Pradipta


Dear Pradipta,


ISIS Draw is a sketch program, so you can create only "flat"
molecules in 2D. You need something to convert them into
real 3D molecules. There are a lot of modeling 
programs for this. As a quick solution, you can download
from the ACD LAbs homepage (www.acdlabs.com) a free plug-in
for ISIS/Draw, which can make this conversion. You can
then export the molecule as a 3D molfile into other programs

Hope this helps

best regards

Tamas Gunda 

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