1. Institute of Organic and Biomolecular
Chemistry, University of Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany
2. Laboratoire des Microorganismes
et des Biomolécules Actives, Faculté des Sciences de
Tunis, Université Tunis El Manar 2093, Tunisia
3. Institute of Biotechnology and Drug Research, Erwin-Schrödinger-Straße
56, D-67663 Kaiserslautern, Germany