Dear all, 

      In my structure, there is a ligand, which
contains a sugar ring. In the process of refinement, refmac always
tried to distort the sugar ring to fit into the density. Is there any
way to fix or restrain the ring conformation more tightly? I know CNS
has such function, just wandering if refmac could do it also. 

      all suggestions are welcome.


changyi                                           

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