Here is one way to do this:
change your mouse mode from “viewing” to “editing”.
left-click on the atoms at each end of the bond you wish to remove,
each atom will highlight with a gray ball around it,
In the command line type "unbond pkset” and hit the enter key,
your bond will be removed.

> On Jun 3, 2019, at 3:15 PM, Hao Li <hlum...@umich.edu> wrote:
> 
> Dear users,
> 
> I am working on a structure of a protein-ligand complex, and the ligand 
> contains an azetidine group. Whenever I display this structure in pymol, an 
> unwanted bond forms between 2 carbon atoms in the azetidine ring. 
> 
> The pdb file of this ligand was generated by Chem3D and the restraint cif 
> file was generated by eLBOW in Phenix. I tried to edit both pdb and cif files 
> of the ligand but it did not work very well. I was able to remove certain 
> atoms but not the bond. 
> 
> I am kindly asking if there is a way to remove this unnecessary bond? Thank 
> you.
> 
> Regards,
> Hao
> 
> 
> 
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