Dear gromacs users,
I am trying to run free energy calculation using the CHARMM force-field.
I am able to generate the .top file, but when I try to obtain the .tpr,
grompp gives the following error:
ERROR 1 [file rest2.top, line 11420]:
Cannot automatically perturb a torsion with multiple terms to different
form.
Please specify perturbed parameters manually for this torsion in your
topology!
So, I am trying to solve the problem converting the multiple dihedral
definitions in the unique and
equivalent Ryckaert-Bellemans.
Is it in your opinion a correct idea?
Is there any reference I can find where the conversion is easly explained?
Thank you,
Francesco
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