1. INSERM U-524 et Laboratoire de Pharmacologie Antitumorale du Centre Oscar Lambret, IRCL, 59045 Lille, France, Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille 2, 59006 Lille, France, Biospectroscopy and Physical Chemistry Unit, Department of Chemistry and Natural and Synthetic Drugs Research Center, University of Liege, Sart-Tilman, 4000 Liege, Belgium, and Napier University, School of Life Sciences, 10 Colinton Road, Edinburgh EH10 5DT, UK