ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, cilt.50, ss.450-453, 1994 (SCI-Expanded)
Rings A and B of the title compounds, C18H15NO3S (1) and C14H15NS2 (2), are planar while the hydrogenated C rings are not. The rings in the tetrahydrocarbazole skeleton are twisted with respect to each other.