Hi Geoff,

testsym.py has been failing due to r4220, an edit to add square planar
functionality. The problem is shown by:

obabel -:c...@](Br)(F)I -osdf --gen3d

In the resulting SDF file, the C is missing an atom parity (it should
be 2, but it's 0). This isn't a trivial problem - it appears to be due
to FindStereogenicUnits(mol, symmetry_classes) not finding the
tetrahedral center. That is, it's called from the smiles parser and it
finds it fine, but later on it's called again and doesn't find it :-/

I can't track down the problem easily but reverting r4220 appears to fix it.

- Noel

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