Please, can you help me with the following problem?:

I have this PDB file (sugar from Protein Data Bank): 
HETATM 3781  C1  MAN C1129      35.524   5.379  57.298  1.00 26.66          
C  
HETATM 3782  C2  MAN C1129      34.930   6.750  56.924  1.00 26.33          
C  
HETATM 3783  C3  MAN C1129      33.464   6.454  56.622  1.00 26.11          
C  
HETATM 3784  C4  MAN C1129      33.300   5.264  55.639  1.00 27.32          
C  
HETATM 3785  C5  MAN C1129      34.075   4.044  56.187  1.00 26.81          
C  
HETATM 3786  C6  MAN C1129      33.940   2.770  55.387  1.00 29.05          
C  
HETATM 3787  O1  MAN C1129      35.436   5.171  58.706  1.00 28.59          
O  
HETATM 3788  O2  MAN C1129      35.526   7.320  55.789  1.00 25.38          
O  
HETATM 3789  O3  MAN C1129      32.846   7.632  56.180  1.00 27.40          
O  
HETATM 3790  O4  MAN C1129      31.911   5.020  55.451  1.00 27.90          
O  
HETATM 3791  O5  MAN C1129      35.457   4.383  56.289  1.00 22.18          
O  
HETATM 3792  O6  MAN C1129      34.428   2.960  54.081  1.00 30.05          
O  
---
In this file, the atoms C1 and O1 have a distance 1.426 A. Therefore the
single bond is between them. 
Note: This C-O bond is the longest C-O bond in this molecule. 

But when I convert this file to MOL, OpenBabel reports a double bond between
C1 and O1. 
All other C-O bonds in the molecule are reported as single.

And OpenBabel insists on the double bond even when I just add hydrogens to
the PDB file.

I used OpenBabel 2.3.2.

Note: I do the conversion from PDB to MOL, because I need chirality data.
And when the double bond is found, the chirality is not reported.

Please, do you have some idea, where is a problem?

Thank you very much for help.



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