Thank you for your advice. I decided to translate my XYZ structure into PDB file with CONNECT records but I observe strange behaviour. Chimera seems not rendering all of bonds. Some of them in dense place, are render as pseudobonds. Is it how it supposed to work? bond command tells me: Attempt to form duplicate covalent bond. I'm including screenshot, and my structure. It's obviously not a protein, but I would like to use some tools from chimera to work with it. Can you help me? -- Michał Kadlof ----- Oryginalna wiadomość ----- Od: "Eric Pettersen" <pett@cgl.ucsf.edu> Do: "chimera-users@cgl.ucsf.edu BB" <chimera-users@cgl.ucsf.edu> DW: "Michał Kadlof" <m.kadlof@cent.uw.edu.pl> Wysłane: środa, 13 styczeń 2016 19:03:32 Temat: Re: [Chimera-users] importing xyz file On Jan 13, 2016, at 9:58 AM, Elaine Meng < meng@cgl.ucsf.edu > wrote: (1) after reading in the XYZ file, add bonds manually yourself, for example, select two “atoms” (Ctrl-click, Shift-Ctrl-click) and then use command “bond sel”. Repeat. This could be tedious if you have a lot of bonds to add. You could also use atom names instead of selecting, for example “bond @c1,c2”. Although the XYZ file doesn’t contain atom names, “atoms” of the same “element” will be named in Chimera according to element with a sequential number appended (the first C is named C1, the second C is named C2, etc.). < http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/xyz.html > And the above could be combined into a script, e.g.: open myfile.xyz bond @c1,c2 bond @c1,c7 … That script file could then be opening with a single command in Chimera: “open myscript.cmd”. —Eric Eric Pettersen UCSF Computer Graphics Lab