When I try obgen on

OCC(=O)[C@@]1(O)CC[C@@H]2[C@]1(C)C[C@H](O)[C@]1([C@H]2CCC2=CC(=O)CC[C@]12C)F

I get a message 

WARNING: damped steplength 16.7257 to 2.25803

on stdout rather than stderr (so dumped into the SDF file making it invalid)


If I edit the SDF file to remove that message, and run obprop, I find that the 
generated structure is

OCC(=O)[C@@]1(O)CC[C@H]2[C@]1(C)C[C@H](O)[C@@]1([C@@H]2CCC2=CC(=O)CC[C@]12C)F

(IE the wrong chirality at the second, fifth and sixth chiral carbons)

For comparison, obgen from the released 2.3.1 produces something which 
obprop-svn4747 reports as

CC(=O)[C@@]1(O)CC[C@H]2[C@]1(C)C[C@@H](O)[C@@]1([C@@H]2CCC2=CC(=O)CC[C@]12C)F

(IE the wrong chirality at the fourth chiral carbon)

I realise that steroids are nasty test cases, but they are annoyingly 
pharmaceutically relevant

Tom
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