[ccp4bb] Cif file in coot

[yang li]

Hi All,
       If I have a pdb with some residues named "abc" in it, coot can read
it and display it well,
but I cannot do real space refine to such residues. The tips asks me to
import a CIF file,
I wonder what is the format of this CIF file? How can I create it and let
coot recognise these
residues? Or there are some other ways to solve it?

Thanks!