1. Institute of Organic Chemistry
2. Johannes Gutenberg-University
3. 55128 Mainz
4. Germany
5. Department of Molecular Biotechnology & Systems Biology
6. University of Kaiserslautern
7. 67663 Kaiserslautern
8. R&D LGCR/Chemistry FF
9. Sanofi GmbH
10. D-65926 Frankfurt am Main