1. Institute of Organic
Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
2. Faculty of Pharmaceutical
Sciences, University of Kinshasa, B.P. 212, Kinshasa XI, Democratic Republic of the Congo
3. Division of Natural Drug Discovery, Institute
of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan