Hi, I have Zn atoms in my pdb for refinement. However, it failed with the following scripts. Do I have to create a libary of this heavy atom? Number of atoms with unknown nonbonded energy type symbols: 6 "ATOM 1 Zn Zn Z 1 .*. Zn " "ATOM 2 Zn Zn Z 2 .*. Zn " "ATOM 3 Zn Zn Z 3 .*. Zn " "ATOM 4 Zn Zn Z 4 .*. Zn " "ATOM 5 Zn Zn Z 5 .*. Zn " "ATOM 6 Zn Zn Z 6 .*. Zn " Time building chain proxies: 1.78, per 1000 atoms: 0.45 Here is the format of my pdb: ..... ATOM 1 Zn Zn Z 1 32.028 47.603 13.955 1.00 30.00 Zn ATOM 2 Zn Zn Z 2 29.017 71.434 8.164 1.00 30.00 Zn ATOM 3 Zn Zn Z 3 39.223 49.330 -6.810 1.00 30.00 Zn ATOM 4 Zn Zn Z 4 24.811 89.144 -4.406 1.00 30.00 Zn ATOM 5 Zn Zn Z 5 23.652 72.429 6.125 1.00 30.00 Zn ATOM 6 Zn Zn Z 6 30.132 63.054 -31.918 1.00 30.00 Zn TER 7 Zn 6 ATOM 10 CL CL L 1 20.125 63.405 10.719 1.00 30.00 CL TER 11 CL 1