How to change angles in Pymol?

Question

I use this

set_dihedral atom1_name, atom2_name, atom3_name, atom4_name, angle

for example

set_dihedral 22/C, 23/C, 26/C, 27/C, 130

So I want to change dihedral bonds this atoms

But when I wrote:

set_dihedral 23/CA, 23/C, 24/N, 24/CH3, 130

I had

SetDihedral-Error: Selection 1 doesn't contain a single atom/vertex.
SetDihedral-Error: Selection 2 doesn't contain a single atom/vertex.
SetDihedral-Error: Selection 3 doesn't contain a single atom/vertex.
SetDihedral-Error: Selection 4 doesn't contain a single atom/vertex.

Answer 1

Are you sure, your 3D file doesn't contain more than one structure with the same names of the atoms you select? You could post your .cif file here. Or maybe you have to use a different selection syntax (e.g. "name" C23, etc. see below).

If I use the structure of stearic acid for example, this works flawlessly:

set_dihedral name c1,name c2,name c3,name c4, 130

enter dihedral angle in PyMOL with a selection of four atoms