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The title compound, C40H34N4S4, crystallizes in the monoclinic system, space group C2/c. The cell parameters are a = 29.888(3)A, b = 5.1829(5)A, c = 22.511(2)A, β = 93.686(5)°, V = 3479.9(5)A3, and Z = 4. The final R value is 0.056. The molecule, half of which is crystallographically independent, is almost planar and has a transoid-configuration.

Crystal Structure of (1,3-Butadiyne-1,4-diyl)-4,4'-bis[7-(3-n-hexyl-2-thienyl)ethynyl-2,1,3-benzothiadiazole]