2-(4-Chloro-2-nitro-phen-yl)-4-meth-oxy-9-phenyl-sulfonyl-9H-carbazole-3-carbaldehyde.

In the sterically hindered title compound, C26H17ClN2O6S, the carbazole ring has a maximum deviation from planarity of 0.067 (4) Å for the C atom connected to the aldehyde group. The carbazole moiety forms a dihedral angle of 72.8 (1)° with the nitro-substituted benzene ring. The O atom of the meth-oxy group deviates by 0.186 (1) Å from the adjacent carbazole moiety. The phenyl-sulfonyl group forms intra-molecular C-H⋯O bonds between sulfone O atoms and the carbazole moiety, resulting in two S(6) rings. In the crystal, the nitrated benzene rings are linked via C-H⋯O inter-actions forming infinite C(7) chains along [100]. The crystal packing is also characterized by C-H⋯π inter-actions, which result in inversion dimers.