Using powder diffraction on different molecular structures(minerals,hydrocarbon)

Dear all,

I have some molecular structures of minerals and hydrocarbons. I have those in PDB file format.I would like to use powder diffraction modules on those structures. I have been able to import these pdb files in materials studio. But I could not do powder diffraction on them as the calculate button gets inactivated for the imported structures.Is there any way I can do powder diffraction on these imported structures?

Your help would be highly appreciated.

Thanks in advance
hfaisal