[gmx-users] adding a negative two charged ion

[CandyCandy]

Dear gromacs users,

I am using genion command to add a negative two charged ion: genion -s water.tpr -o watern.gro -nq 2 -nname O- -nn 1 -g watern.log.

It does not work. It shows: 

Fatal error:
No such moleculetype O

Could anybody give me some idea about making a -2 charged ion? Thank you so much!

Best regards,

Candy
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