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Hello Lixin--

> We have trouble adding C-terminal CH2OH group on the last residue Thr. 
> We made a presidue CTOH as following. However it didn't work, we had
> error msgs such as missing improper parameters, improper energy constant
> missing, target improper value missing. What did we miss in this
> topology file? or do we have another way to get the c terminal capped
> on? 

You changed the type of the C atom, so so need to specify a new improper
parameter: 

param
  improper  HA   NH1  CT    CT       $kchi    0   65.977  ! CA chirality
end

ok?

Charles
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