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In the title mol­ecule, C 24 H 26 N 2 O 2 , the two indol-2-one units, which are connected by a C=C double bond, are almost coplanar with an inter­planar angle of 6.8 (1)°. On cooling from 293 to 120 K, the space group changes from  P 2 1 / n  to  P 2 1 . Two intra­molecular C—H⋯O hydrogen bonds occur.

(E)-1,1′-Dibutyl-3,3′-biindolinylidene-2,2′-dione