Dear all gmx users and developers,

The structure of mine is:

C-C-C-C-C-C-C-C-C=C-C-C-C-C-C-C-C-C-O
                                    |
  C-C-C-C-C-C=C-C-C=C-C-C-C-C-C-C-C-C=O
            # # * # #                 
                                    
I use opls_142 for the carbon labeled with symbol #
while opls_136 for the carbon labeled with symbol *.

The warning appeared during grompp was at the carbon
with * symbol.

The warning statements are as follow:
   warning 1 [File "p1.top" line 208]
      No default Ryckaert-Bell. type, using zeros.
 
    warning 2 [File "p1.top" line 209]
      No default Ryckaert-Bell. type, using zeros.


I try the possible force field but still cant get the
correct one.

I am using OPLS-AA force field for my simulation.

Any suggestions to replace the correct value?


Any suggestions and comments are appreciated.
Thanks.


      
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