1. Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan
2. Department of Chemistry, University of Namur (UNamur), 61 Rue
de Bruxelles, B-5000 Namur, Belgium
3. Biometal Science Laboratory, RIKEN, SPring-8 Center,
1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
4. Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0862, Japan