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A phosphine-catalysed addition of gramine to an alkyl­idene­amino­nitrile gives the title compound, C 25 H 24 N 4 , in good yield. In the crystal, pairs of mol­ecules are connected  via  N—H⋯N hydrogen bonds into inversion dimers. The mol­ecules are characterized by a planar indole moiety [maximum deviation = 0.012 (1) Å], a chair conformation of the cyclo­hexane ring and an anti­periplanar conformation of the H atom on the cyclo­hexane and the adjacent cyano group.

rac-4-{(E)-[1-Cyano-1-cyclohexyl-2-(1H-indol-3-yl)ethyl]iminomethyl}benzonitrile