1. Laboratoire de Chimie
2. CNRS
3. École Normale Supérieure de Lyon
4. F-69364 Lyon 07, France
5. Institute of Organic Chemistry and Biochemistry
6. Academy of Sciences
7. 16610 Prague, Czech Republic
8. Dipartimento di Chimica e Chimica Industriale
9. Università di Pisa
10. I-56126 Pisa, Italy