1. Laboratory of Pharmacognosy and Laboratory of Pharmaceutical Chemistry, Department of Pharmacy, University of Athens, Panepistimiopolis Zografou, GR-15771 Athens, Greece, Structural Biology Unit, Department of Experimental Oncology, European Institute of Oncology, Via Ripamonti 435, 20141 Milano, Italy, 3, Centre for Structural Biology, Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London SW3 6JB, U.K., C.N.R.S., Cell Cycle Group, Station Biologique, B.P. 74, 29682 ROSCOFF...