I want to draw a cubic (Pm3m) structure of CH3NH3PbI3 perovskite. How can I add the MA molecule (CH3NH3) to the A position of the ABX3 structure, like an element? I can draw a triclinic (P1) structure (perovskie1) but by changing its space group to cubic (Pm3m), it changes to a complicated structure (perovskite2).

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