... solving a structure of a cyclic peptide with Ornithine residue, where Orn side-chain participates in an amide bond.

Normally I use Molmol to calculate fitted structure ensembles, but in this case Ornithine is a non-standard residue and is not part of Molmol residue library.

Could anyone give an advice - what software could open pdb's or equivalent data formats of arbitrary molecules and fit structures? Is it possible with Molmol?

Will be super thankful for your advice.

... solving a structure of a cyclic peptide with Ornithine residue, where Orn side-chain participates in an amide bond.

Normally I use Molmol to calculate fitted structure ensembles, but in this case Ornithine is a non-standard residue and is not part of Molmol residue library.library the the program cannot display it.

Could anyone give an advice - what software could open pdb's or equivalent data formats of arbitrary molecules and fit structures? Is it possible with Molmol?

Will be super thankful for your advice.