Hi Manoj, The error says that chain id, residue id and atom name are the same for several atoms. And there should be listing of such atoms after the error. You may try to change chain id or residue number of your new ligand, if this is the case. Best regards, Oleg Sobolev. On Sun, Aug 23, 2015 at 8:14 PM, Manoj saxena wrote:

Greetings I am trying to place a ligand (CIT) in a protein model that already have some citrate ligands placed. I am doing this using Coot's option "get monomer", and after the fitting of ligand in the density I tried to refine the model using the ligand and the protein pdb as input models. Refinement did not start and I got an error message in Phenix- "Number of groups of duplicate atom labels:....." Could someone please explain how could I get past this error message and what is the correct way to add a ligand to a model that already has some of the ligands of the same type.

Many thanks in advance

Regards

Manoj Saxena

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