1. Department of Chemistry and Biochemistry
2. University of Berne
3. 3012 Berne
4. Switzerland
5. Dipartimento di Chimica
6. Polo Scientifico e Tecnologico
7. Universita' degli Studi di Firenze
8. Firenze
9. Italy
10. Centre de Recherches sur les Macromolécules Végétales
11. UPR5301
12. CNRS and Université Grenoble Alpes
13. F38041 Grenoble
14. France