1. Department
of Chemistry, Biology and Biotechnology, University of Perugia and CIRCC, Via Elce di Sotto, 8, I-06123 Perugia, Italy
2. Department
of Chemistry, Longwood University, 201 High Street, Farmville, Virginia 23901, United States
3. Department
of Chemistry, University of Torino, Via Pietro Giuria 7, 10125 Torino, Italy
4. Department
of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg
2, CH-8093 Zürich, Switzerland