[phenixbb] Restraints file for a new amino acid residue

Hi We are trying to refine a protein structure with a (covalently) modified residue. The colosest discussion to our problem is: http://www.phenix-online.org/pipermail/phenixbb/2010-August/015629.html We ran: phenix.elbow --residue SSC ourmodel.pdb And read the due cif file at phenix refinement. The residue by itself is OK, but we were not able to perform the peptide bond between C and N. How to complete the .cif file such that it has due restraints for the peptide bond with this modified residue? Agnes