Dear Chimera users,
To get
Amber prmtop file corresponding to a
pdb file using Chimera, I did the following steps:
1] tools -> Amber -> write prmtop
2] In a pop-up window 'save file in chimera', I gave file name, say, aa.prmtop, then clicked save.
3] No charges message appeared, then I clicked 'Assign charges'.