1. Department of Chemistry, Faculty of Science, Kumamoto University, Kumamoto 860-8555, Japan
2. Department of Engineering Science, The University of Electro-Communications, Chofu, Tokyo
182-8585, Japan
3. Department
of Chemistry, Faculty of Science, Okayama University, Tsushima-naka 3-1-1, Okayama 700-8530, Japan
4. Facolta di Farmacià, Universita degli Studi “G. D. Annunzio”, I-66100
Chieti, Italy