1. Department of Chemistry RCSI University of Medicine and Health Science 123 St Stephen's Green Dublin 2, Dublin Republic of Ireland
2. CNR-ICC Institute of Crystallography Via G. Amendola 122/O 70126 Bari Italy
3. Department of Chemistry and Biochemistry University of California, Los Angeles Los Angeles CA 90095-1569 USA
4. Department of Chemistry State University of NY Binghamton Binghamton, NY USA
5. Institute of Organic Chemistry Johannes Kepler University Linz Altenbergerstrasse 69 4040 Linz Austria
6. Faculty of Pharmacy University of Naples Federico II Corso Umberto I, 40 80138 Napoli, NA Italy