Nuclear magnetic resonance spectral analysis and conformational properties of 11-benzoyl-9,9a,10,11-tetrahydro-4H-indolo[4,3-ab]carbazole - Mavromoustakos, T.; Stamos, I.K.; Kamoutsis, C.; Theodoropoulou, E.; Zervou, M.; Humpfer, E. (Journal of Pharmaceutical and Biomedical Analysis, 1998)