Ghirtis, K. Pouli, N. Marakos, P. Skaltsounis, A.-L. Leonce, S. Atassi, G. Caignard, D.H., Design and synthesis of some new pyranoxanthenones with cytotoxic activity, Journal of Heterocyclic Chemistry, (38), 147-152, 2001, 0022-152X, 1943-5193