[ccp4bb] Refmac and planar amide restraint

[Jason Greenwald]

Dear all,
How does one tell Refmac that the bond between two non-amino-acid  
monomers should be planar (in the case that this bond is an amide)?
My ligand has amino-acid and non-animo-acid constituents that are  
connected via amides. I have made library definitions for all of the  
non-standard parts and Refmac accepts these and makes the bonds  
between the various monomers in the ligand.... but treats them as  
single bonds and therefore fully rotatable.

Cheers.
Jason