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Short contacts (dashed lines) between adjacent molecules in the crystal structure of 4. The minor component of the disordered trifluoromethyl group is omitted for clarity. Symmetry codes: (i) −x + 1, y + 
, −z + ; (ii) −x + , y + , z; (iii) x, y + 1, z; (iv) x + 
, −y + , −z.
