1. Accelerator Laboratory, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba 305-0801, Japan
2. Department of Chemistry, Faculty of Science Division I, Tokyo University of Science, 1-3 Kagurazaka, Tokyo 184-8501, Japan
3. CNRS, UPR 9080, Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique, Fondation Edmond de Rothschild, Université Paris Cité, 13 Rue Pierre et Marie Curie, 75005 Paris, France