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The molecule of the title compound, C 18 H 14 N 4 , lies on a center of inversion such that there is one half-mol­ecule in the asymmetric unit. The N—N single bond adopts a  trans  configuration and the indole fused-ring system is nearly coplanar with the –CH=N—N=CH– fragment [dihedral angle = 9.8 (2)°]. Adjacent mol­ecules are linked by indole–azine N—H⋯N hydrogen bonds into a layer motif.

1H-Indole-3-carbaldehyde azine