I don't know if this is a duplicate of
https://github.com/rdkit/rdkit/issues/435
I notice that ring double-bond stereo gets quietly ignored by the embedding
code. Trying to make cis and trans cyclododecene (choosing a large ring to
minimize any strain), and they both come out cis.
Using the SMILES "C/1=C\CCCCCCCCCC1" and "C/1=C/CCCCCCCCCC1", the 3D
structure comes out cis for both
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