Kostakis, I.K. Pouli, N. Marakos, P. Mikros, E. Skaltsounis, A.-L. Leonce, S. Atassi, G. Renard, P., Synthesis, cytotoxic activity, NMR study and stereochemical effects of some new pyrano[3,2-b]thioxanthen-6-ones and Pyrano[2,3-c]thioxanthen-7-ones, BIOORGANIC AND MEDICINAL CHEMISTRY, (9), 2793-2802, 2001, 0968-0896