1. Departement für Chemie
und Biochemie, Universität Bern,
Freiestrasse 3, CH-3012 Bern, Switzerland
2. CNR-IOM, Unità SLACS, S.P. Monserrato-Sestu Km 0.700, I-09042 Monserrato
(CA), Italy
3. Basilea Pharmaceutica International Ltd., Grenzacherstrasse 487, CH-4005 Basel,
Switzerland
4. Department of
Physics, University of Cagliari, S.P. Monserrato-Sestu
Km 0.700,
I-09042 Monserrato (CA), Italy