1. Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Ataturk University, Erzurum, Turkey,
2. Polo Scientifico, Laboratorio di Chimica Bioinorganica, Universita degli Studi di Firenze, Sesto Fiorentino, Italy, and
3. Division of Pharmacology, Meikai University School of Dentistry, Sakado, Saitama, Japan