1. Department of Theoretical Chemistry, School of Biotechnology, Royal Institute of Technology, SE-10691 Stockholm, Sweden
2. University of Strasbourg, Faculty of Pharmacy UMR/CNRS 7199, Laboratory of Functional ChemoSystem, 74, route de Rhin BP60024, 67401 Illkirch, France
3. Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden