Craig A. James wrote:
> Andreas Maunz wrote:
> 
>> can't figure out what's wrong with this SMARTS:
>> F-c1:c:c2:c(:c(:c:n:c:2:c:c:1-N1-C-C-N-C-C-1)-C(-O)=O)=O
> 
> There's nothing wrong with it.  There's a bug in the SMARTS parser.  This is 
> the same thing, which also gives an error:
> 
>     Fc1cc2c(c(cnc2cc:1N1CCNCC1)C(O)=O)=O
> 
> If you take out the ':', obgrep parses it correctly.  You should file a bug 
> report.

Incidentally, neither of these are recognized as valid SMILES by 
Daylight's DEPICT because it requires the hydrogen on the aromatic 
nitrogen to be explicit:

  Fc1cc2c(c(c[nH]c2cc1N1CCNCC1)C(O)=O)=O

But used as SMARTS you may wish to match molecules which do not have 
a hydrogen there. OpenBabel's more relaxed SMILES parsing seems more 
appropriate in this case. I hope Craig will not feel he has to change 
it so that it conforms ;-)

Chris

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