Experimental Crystal Structure Determination (CSD) Entry UVUNAD: tetrakis(μ-propenyl)-tetrakis(μ-N²,N⁴-bis[2,6-bis(propan-2-yl)phenyl]pentane-2,4-diiminato)-tetra-ytterbium(ii). Chemical formula: C₁₂₈ H₁₈₄ N₈ Yb₄,C₆ H₆. Space Group: P 2₁/n (14). Cell: a 18.4011(6)Å b 16.5304(5)Å c 21.0634(6)Å, α 90° β 104.094(3)° γ 90°.