Here's the explanation of the RDKit's aromaticity model:
https://github.com/rdkit/rdkit/blob/master/Docs/Book/RDKit_Book.rst#aromaticity

-greg


On Tue, Oct 11, 2016 at 9:28 AM, Jean-Marc Nuzillard <
jm.nuzill...@univ-reims.fr> wrote:

> Hi,
>
> maybe I am a bit off topic but I would not have said that the nitrogen
> containing ring is aromatic.
> Of course, if all bonds are forced to be aromatic when they are not
> necessarily, you may end up
> with inconsistencies. A nitrogen in an aromatic ring should bear a
> positive
> charge when it bears an hydrogen atom (like in a pyridinium ion).
> I doubt (but this is only my opinion) that Out[56] represents an entity
> with a chemical reality.
>
> The anthracene part in Out[58] could be drawn with aromatic bonds (or a
> circle in the middle
> of the two hexagons), but I think that the third ring must be left with an
> explicit double bond.
>
> All the best,
>
> Jean-Marc
>
>
> Le 11/10/2016 à 00:31, Peter S. Shenkin a écrit :
>
> Hi,
>
> Please see the attached image for (1) and (2).
>
> 1. If I render a molecule via 'SVG(svg)', I get the dotted aromatic
> representation.
>
> 2. If I render it just by displaying 'MolFromSmiles(smi)', I get the
> kekulized representation.
>
> So I guessed that (for some reason) when SVG is used, RDKit automatically
> uses the dotted representation.
>
> 3. However, if I display MolsToGridImage(mol, useSVG=True), I get the
> kekulized form. (This method does not return an SVG, and therefore I cannot
> display it using 'SVG(result)' ).
>
> So I have several questions:
>
> a. Is there a way to force MolsToGridImage to return the dotted aromatic
> representation? Or to postprocess the result to achieve this?
>
> b. What is the underlying paradigm which dictates which representation
> will be shown, and how can it be controlled?
>
> c. What I would really like is the "circle" representation (i.e., benzene
> as a hexagon with a circle inside). Can this be achieved, and if so, how?
>
> Thank you,
> -P.
>
>
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>
> --
> Jean-Marc Nuzillard
> Institut de Chimie Moléculaire de Reims
> CNRS UMR 7312
> Moulin de la Housse
> CPCBAI, Bâtiment 18
> BP 1039
> 51687 REIMS Cedex 2
> France
>
> Tel : 03 26 91 82 10
> Fax : 03 26 91 31 66http://www.univ-reims.fr/ICMR
> http://www.univ-reims.fr/LSD/http://www.univ-reims.fr/LSD/JmnSoft/
>
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