;protein ff (needed for the water itp file
#include  "amber99sb-ildn.ff/forcefield.itp" 

;ligand itp file
#include "LIG.itp"

;water itp
#include  "amber99sb-ildn.ff/tip3p.itp" 

[ system ]
; Name
Protein in water

[ molecules ]
; Compound        #mols
LIG              1