[gmx-users] problem in recognising the atom type

[gurpreet singh]

Hello Users

I am using gromacs 3.3 with the force field 43a1.

I have an organic compund in my simulation so i used the Dundee Prodrg2
server for getting the .itp file. Then i added the corresponding .itp file
in the top file .
While running the grompp i am getting the following error
Fatal error:
Atomtype 'OS' not found!
OS is one of the atom type in the .itp file generated above.  i have checked
in the manual this is a well  defined atom type so what else could be the
reason for this problem.

Waiting for your  early reply


Thanks & Regards
Gurpreet
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