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Figure 3 View of intra-cluster hydrogen bonding interactions (dash lines), showing the donor and acceptor atoms in a ball-and-stick model and with 50% probability ellipsoids for the incomplete cubane core. Weak C—H⋯O hydrogen bonding interactions are omitted. [Symmetry codes: (i) 1 − x, − + y, 1 − z (ii) −1 + x, y, z (iii) 1 + x, y, z.] |