Hi Jean-Marc,

I can't reproduce that:

In [2]: m = Chem.MolFromSmiles('CN1CCC[C@H]1c1cccnc1')

In [3]: Chem.MolToSmiles(m,isomericSmiles=True)
Out[3]: 'CN1CCC[C@H]1c1cccnc1'

In [4]: Chem.MolToSmiles(m,isomericSmiles=True,allHsExplicit=True)
Out[4]: '[CH3][N]1[CH2][CH2][CH2][C@H]1[c]1[cH][cH][cH][n][cH]1'


Can you send some sample code that shows the problem?

-greg


On Mon, Jun 19, 2017 at 10:59 AM, Jean-Marc Nuzillard <
jm.nuzill...@univ-reims.fr> wrote:

> Dear All,
>
> Chem.MolToSmiles(m, isomericSmiles=True, allHsExplicit=False) with m being
> nicotine downloaded from PubChem returns
> CN1CCC[C@H]1c1cccnc1 , which is consistent with the structure of nicotine.
> Chem.MolToSmiles(m, isomericSmiles=True, allHsExplicit=True) returns
> [CH3][N]1[CH2][CH2][CH2][CH]1[c]1[cH][cH][cH][n][cH]1 in which chirality
> has disappeared.
> Would it be possible to get H count and chirality?
>
> All the best,
>
> Jean-Marc
>
> --
> Jean-Marc Nuzillard
> Directeur de Recherches au CNRS
>
> Institut de Chimie Moléculaire de Reims
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