Hi, I'm getting a glitch when I try to read my pseudo PDB files from CNS (as pseudoPDB with IUPAC naming). When reading the terminal carboxylic acid oxygens O & OXT, formatConverter offers to link both to O' (but not O'') and then complains (sensibly) about assigning two sets of coords to one atom: Error: coordinate atom O' ( ,129) already exists and already has a coordinate Is the problem on the formatConverter side, or is my atom naming wrong? -- Dr. Brian O. Smith ---------------------- B Smith at bio gla ac uk Division of Biochemistry & Molecular Biology, Institute Biomedical & Life Sciences, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, UK. Tel: 0141 330 5167/6459/3089 Fax: 0141 330 8640