The packing structures of cubane-type compounds are of considerable interest in crystal engineering. In this case, the size mismatch between the cubane core and typical alkyl chain spacing (∼4. However, in the pseudo-polymorphic γ-form (space group I-4, Z = 2), the alkyl chains are nearly aligned along the a-axis (Fig. ) and Fig. ), ESI †), creating a void (V = 244 Å 3 ) at the unit cell center, occupied by solvate molecules. This void is enclosed by four alkyl chains from two adjacent molecules arranged along the c-axis. The asymmetric unit in this polymorph contains a quarter of the tetranuclear complex.