While waiting for knowledgeable help, one possibility is that your pdb 
isn't being read flexibly enough (this would be surprising, but would 
explain the symptom). In particular, if the 'prime' symbol falls outside 
of the column range it is supposed to be in, C5' would read as C5.
You could blindly try shifting the atom name one character to the left 
to see if it works:
$ sed 's/ C5'/C5' /g' SAM68-C25-BOX.pdb > newtry.pdb
Bill
On 4/4/17 1:50 AM, Sidhu, Khushwant (Dr.) wrote:
> more SAM68-C25-BOX.pdb|grep -v WAT|grep 5360
> ATOM   5360  C5' C     326      -6.295  26.880  17.879  1.00  0.00
> more SAM68-C25-BOX.pdb|grep -v WAT|grep 5371
> ATOM   5371  C5  C     326      -6.351  30.781  20.616  1.00  0.00
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Received on Tue Apr 04 2017 - 02:30:02 PDT