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The title compound, C 30 H 32 N 4 , was synthesized by the photodimerization of  trans -4-{2-[4-(di­methyl­amino)­phen­yl]ethen­yl}pyridine in benzene upon irradiation with UV light. This photodimer has a puckered cyclo­butane ring with the four aryl substituents in an  r -1, t -2, c -3, t  conformation. The puckering angle of the cyclo­butane ring is 32.22 (7)°, which is the largest among reported tetra­aryl-substituted cyclo­butanes. In the crystal, the mol­ecules form a hollow, one-dimensional structure extending parallel to the  c  axis  via  two different pairs of C—H⋯π inter­actions.

r-1,t-3-Bis[4-(dimethylamino)phenyl]-c-2,t-4-bis(pyridin-4-yl)cyclobutane