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This PR fixes E/Z assignment for some edge cases (e.g.
F\C=C\C=C\F
). In addition, it raises an error for invalid SMILES like(F\)C=C
. In doing so it unfixes extended CIS/TRANS (e.g.F\C=C=C=C\F
). I think it is worth not including these at the moment. It does throw an error for the extended CIS/TRANS. It also handles multiple CIS/TRANS per double bond (e.g.C(\F)(/F)=C(/Cl)(\Br)
and checks if they are compatible.