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Molecular structure of 1,7-bis(1,7-dicarba-closo-dodecaboran-9-ylmethyl)-1,7-dicarba-closo-dodecaborane (4). Hydrogen atoms are omitted for clarity. Thermal ellipsoids are drawn at the 50% probability level. Selected bond lengths [pm] and bond angles [°]: C1–C3 153.5(2), C3–B20 160.1(3), C2–C6 153.0(2), C6–B30 159.6(3); C1–C3–B20 123.0(2), C2–C6–B30 124.2(2).
