1. Institute
of Organic Chemistry, Saarland University, Campus C 4.2, 66123 Saarbrücken, Germany
2. Institute
of Inorganic Chemistry, Saarland University, Campus C 4.1, 66123 Saarbrücken, Germany
3. Institute
of Organic Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
4. Nees-Institute
for Biodiversity of Plants, University of Bonn, Meckenheimer Allee
170, 53115 Bonn, Germany