1. Centre
de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
2. Department
of Pathology, University of Louisville, 323 East Chestnut Street, Louisville, Kentucky 40202, United States
3. Department
of Chemistry, Wayne State University, 5101 Cass Ave, Detroit, Michigan 48202, United States