[gmx-users] Incomplete ring

[you zou]

Hi Users,
I have a .pdb file, in this file when I want to use pdb2gmx command there is this error massage:Fatal error:Incomplete ring in HIS680
this aminoacid is not complete in general, I don't know how can I complete this such that I don't add HIS for complete? Please give me a hint.
Thank you 		 	   		  
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