I am interesting in modeling a small molecule ligand-protein complex that 
involves a cationic ligand encapsulated by several aromatic residues that form 
a box around the cation. However, md simulations result in the cation moving 
outside the box. I am using the CHARMM27 forcefield. Is there a way to restrain 
the cation portion of the small molecule to within the aromatic box? Or is 
there a better forcefield, which will take these interactions into 
consideration.
Thanks.
Egy--
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