Indizoline

The title compound [systematic name: 1-meth­oxy-2-(3-methyl­but-2-en­yl)-9H-carbazole-3-carbaldehyde], C(19)H(19)NO(2), is a natural carbazole which was isolated from the twigs of Clausena lansium. The carbazole ring system is essentially planar with a mean deviation of 0.0068 (10) Å. The aldehyde substituent is approximately co-planar with the attached benzene ring with a torsion angle of −8.58 (14)°, whereas the meth­oxy group is rotated out of the benzene plane with a torsion angle of −82.17 (11)°. The dihedral angle between the mean planes of the 3-methyl-2-butenyl group and the carbazole ring is 88.06 (5)°. An inter­molecular N—H⋯O inter­action connects the mol­ecules into a chain along the a axis. The crystal is further consolidated by a C—H⋯O hydrogen bond and two π–π inter­actions with centroid–centroid distances of 3.6592 (6) and 3.7440 (6) Å.