chirality not being used in atom ranks for chiral spiro four-ring linkage

[greglandrum]

There's some order-dependence problem in the calculation of canonical atom ranks here:

from rdkit.Chem import Draw
m2a = Chem.MolFromSmiles('C([C@H](C)C1)[C@]12CCN2')
m2b = Chem.MolFromSmiles('C[C@H](C1)C[C@]12CCN2')
aranks = Chem.CanonicalRankAtoms(m2a,breakTies=False)
branks = Chem.CanonicalRankAtoms(m2b,breakTies=False)
for i,rnk in enumerate(aranks):
    m2a.GetAtomWithIdx(i).SetProp("atomNote",str(rnk))
for i,rnk in enumerate(branks):
    m2b.GetAtomWithIdx(i).SetProp("atomNote",str(rnk))
Draw.MolsToGridImage((m2a,m2b))

Here's the drawing of the two molecules with the atom ranks shown as atom annotations:

The original form of this was found and reported by @ptosco