1. Departments of Chemistry and Entomology, University of California, Riverside, California 92506, United States
2. Institute of Biosciences and Bioresources (IBBR), National Research Council of Italy (CNR), Corso Calatafimi 414, 90129 Palermo, Italy
3. Institut für Organische Chemie, TU Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
4. Dipartimento di Scienze Agrarie, Alimentari e Forestali, Università degli Studi di Palermo, Viale delle Scienze edificio 5, 90128 Palermo, Italy