[gmx-users] Why the carbons in the benzene can not keep in the plane when i do the bd?

[Hanming]

Hi, All, 

I use the same .gro and .top file to do the MD and BD. The strange thins is
that the carbons in the benzene can not keep in one plane when i do the BD
while it is ok in MD.
Who knows why? 

Thanks, 

Ming