
Just run the following command:

   gmdff acetic.gro

This will create:

   acetic.gro
   acetic.itp
   acetic.zip

To visualize the structure, try:

   sview acetic.gro
   jmol acetic.gro
   vmd acetic.gro

Please note that, in this example, the anion charge initially recorded in the ITP file does not have an integer value. 
The GMDFF module corrected the residual charge in the new ITP file generated through the procedure.

Additionally, it is possible to perform a conformational analysis after correcting the force field parameters. To do this, simply run the following command:

   gmdff acetic.gro -key "XTB Opt Freq"

In this case, the "-key" option informs the level used in the geometry optimization. Here, the xTB level was chosen only to perform a quick test. Alternatively, it is possible to perform the conformational analysis before the procedure of creating the force field parameters. To do this, simply run the following command:

   confs acetic.gro -key "XTB Opt Freq"

In this case, running the GMDFF module eliminates the need to use the conformational analysis run option.

