Carbazole
(4aS,4E)-4-Ethylidene-4,4a,5,6-tetrahydro-7,16-dimethyl-1H,3H,7H-6α,11cα-(epoxymethano)-6aα,11bα-(iminoethano)pyrano[4,3-c]carbazole-3,12-dione
Benzamide, N,N'-(5,6,7,12,17,18,19,24-octahydro-5,7,12,17,19,24-hexaoxodinaphtho(2,3-i:2',3'-i')benzo(1,2-a:4,5-a')dicarbazole-11,23-diyl)bis-