creating topology for a unique structure

From: soroush ziaei (
Date: Sun Nov 04 2018 - 02:02:03 CST

hi all,
i have some structure that doesn't have any similar topology in charmm22
(protein) & charmm 27 (lipid) and i have tried several servers such as,
cgenff & swiss param, but the .rtf file generated from this method
gathering all of atom types in one group, why?
is there something that i might be missing?
meanwhile, i want to use this topology in order to detect groups and atoms
for running free energy perturbation simulation (fep)...
what should i do?
if someone who know the solution, i must to tell please guide me, i


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