Have you tried the development version? This has been rewritten.

On Fri, 16 Nov 2018, 00:19 Stefano Forli <fo...@scripps.edu wrote:

> Hi,
>
> I've found a series of molecules that trigger what looks like a bug but I
> want to make sure there isn't something clearly wrong with the structures,
> before reporting it.
>
> The molecules look fine when inspecting them in 3D (Pymol), but OpenBabel
> (both 2.3 and 2.4) parse the structures removing entirely the aromaticity
> information.
>
> $ obabel ZINC000008616812.mol2 -ocan
> C[C@@H]1CC[C@@H]([C@@H]2[C@@H]1[NH2+][C@@H](C)CC2=O)Cl  ZINC000008616812
> 1 molecule converted
>
> $ obabel  ZINC000000119428.mol2 -ocan
> Cl[C@@H]1CC[C@@H](CC1)N1NNN[C@@H]1[C@H]1C[NH2+][C@@H]2[C@@H](C1=O)CCCC2
> ZINC000000119428
> 1 molecule converted
>
> I don't think in this form the 4-pyridone is aromatic, but I still think
> there's something wrong with the way the valence information is lost when
> parsing the structures.
>
> Any clues?
>
> Thanks,
>
> S
> --
>
>   Stefano Forli, PhD
>
>   Assistant Professor
>   Dept. of Integrative Structural
>   and Computational Biology, MB-112A
>   The Scripps Research Institute
>   10550  North Torrey Pines Road
>   La Jolqla,  CA 92037-1000,  USA.
>
>      tel: +1 (858)784-2055
>      fax: +1 (858)784-2860
>      email: fo...@scripps.edu
>      http://www.scripps.edu/faculty/forli/
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