I have a system described below

cation.pdb

anion.pdb

cation.mol2

anion.mol2

(cation+anion).pdb (300 each obtained from packmol)

frcmod.anion

frcmod.cation

How can I obtain (cation+anion).prmtop and (cation+anion).inpcrd of Amber and convert them into Gromacs format.

Thanks, in anticipating your kind responds.