I am trying to refine a protein with two ligands. One of the ligands apparently will not allow me to do real space refinement in coot after I import it as a cif file, created from sketcher. It is a known ligand in structure deposited in the pdb as 1RQI. I could not retrieve the ligand with the three letter code and the file looks similar to the other ligand, except it contains a sulfur. Any help would be appreciated.
Bobby Barnett
