Hi Yingfeng,

You should use the NeutralisingCompounds on the page Markus linked: 
http://www.rdkit.org/docs/Cookbook.html. This version has different SMARTS for 
neutralising Tetrazoles.

In the version you linked:
# Tetrazoles
        Chem.MolFromSmarts('[n-]'):                     Chem.MolFromSmarts('n'),
In the cookbook version:
# Tetrazoles
        ('[n-]','[nH]'),

J

On 19 Dec 2013, at 20:59, Yingfeng Wang <ywang...@gmail.com> wrote:

> The original compound is
> CCCc1nc2ccc(Cl)nc2n1-c1ccc(-c2ccc(-c3ccccc3Cc3nn[n-]n3)cc2)cc1
> 
> I used the code at the following link 
> 
> http://code.google.com/p/rdkit/wiki/NeutralisingCompounds
> 
> , and got the neutralized compound
> 
> CCCc1nc2ccc(Cl)nc2n1-c1ccc(-c2ccc(-c3ccccc3Cc3nnnn3)cc2)cc1
> 
> But it has a problem,
> 
> >>> mol = 
> >>> Chem.MolFromSmiles("CCCc1nc2ccc(Cl)nc2n1-c1ccc(-c2ccc(-c3ccccc3Cc3nnnn3)cc2)cc1")
> [15:53:43] Can't kekulize mol 
> 
> Could you please help me to check whether there is a workaround?
> 
> Thanks.
> 
> Yingfeng
> 
> 
> 
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