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In the title compound, C 18 H 19 BrN 2 O, the seven-membered azepine ring adopts a twist-boat conformation: the bond angles about the azepine N atom are indicative of  sp2  hybridization. The dihedral angle between the plane of the carbon–carbon double bond of the enone unit and the mean plane of the indole ring is 27.8 (1)°. In the crystal, an N—H⋯O hydrogen bond links the mol­ecules into chains along the  b  axis.

1-[(E)-4-(5-Bromo-1H-indol-3-yl)-1-methyl-2,5,6,7-tetrahydro-1H-azepin-2-ylidene]propan-2-one