1. Department
of Pharmaceutical Chemistry and Bioanalytics, Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-St. 4, D-06120 Halle (Saale), Germany
2. Institute
of Biochemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str.
3, D-06120 Halle
(Saale), Germany
3. Institute
for Organic Chemistry, Department of Chemistry, University of Cologne, Greinstr. 4, D-50939 Cologne, Germany