[gmx-users] sulfate in topology file with oplsaa forcefield

[you zou]

Dear users,
I have to complete my topology file and there is sulfate(SO4(-2)) in pdb file. 
But I don't know how can I complete this file with oplsaa forcefield. I can't 
find so4 in ffopls.tpr file. I would really appropriate if you could do this 
for me.
thank you                                         
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