title: 8-Meth-oxy-3,3,5-trimethyl-3,11-dihydro-pyrano[3,2-a]carbazole.
abstract: In the title compound, C(19)H(19)NO(2), commonly called koenimbine, the pyran ring adopts a sofa conformation. The carbazole ring system is planar [r.m.s. deviation = 0.063 (1) Å]. A C(10) zigzag chain running along the b axis is formed through inter-molecular C-H⋯O hydrogen bonds. The chains are linked via weak C-H⋯π and N-H⋯π inter-actions.
authors.forename: C
authors.initials: C
authors.lastname: Uvarani
authors.forename: P
authors.initials: P
authors.lastname: Ramesh
authors.forename: K
authors.initials: K
authors.lastname: Ravichandran
authors.forename: P S
authors.initials: PS
authors.lastname: Mohan
authors.forename: M N
authors.initials: MN
authors.lastname: Ponnuswamy