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(a) Rigid-body Rietveld refinement of the structure against the XRPD pattern obtained from spray drying. The experimental and calculated patterns are shown in black and red, respectively, with the difference plot shown in blue. The calculated position of reflections is shown as black tick marks; (b) hydrogen bonding in ζ-CPA as viewed along the [100] direction; this marks a change to a H-type configuration of hydrogen-bonded molecules (c).
