Hi all,

I don't know if it could be related to some recent messages about
stereo problems, but converting a .can file (obtained with pybel /
babel 2.2.3) to still a .can file with babel 2.3 (downloaded and build
yesterday morning 19th) invert the E/Z stereochemistry.

Eg the E form
COc1cccc(c1)NS(=O)(=O)/C=C/c1ccccc1     ZINC00245228
is converted in Z form with command line babel 2.3 (babel zinc.smi zinc.can)
COc1cccc(c1)NS(=O)(=O)/C=C\c1ccccc1   ZINC00245228
The smiles is not changed with command line babel 2.2.3.

Same problem with eg
CCOC(=O)C1=C(/C=C/c2ccccc2)NC(=O)n...@h]1c     ZINC00358965
converted in
CCOC(=O)C1=C(/C=C\c2ccccc2)NC(=O)n...@h]1c     ZINC00358965

Starting from Z gives E too with babel2.3.

Regards,
Pascal

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