1. Graduated School of Pharmaceutical Sciences; Kumamoto University; 5-1 Oe-honmachi Kumamoto 862-0973 Japan
2. Graduated School of Integrated Arts and Sciences; Hiroshima University; 1-7-1 Kagamiyama Higashi-hiroshima 739-8521 Japan
3. Section for Eukaryotic Biotechnology, Departments of System Biology; Technical University of Denmark; Building 221 2800 Kongens Lyngby Denmark
4. Life Sciences Institute and Departments of Medicinal Chemistry, Chemistry, Microbiology & Immunology; The University of Michigan; 210 Washtenaw Avenue Ann Arbor MI 48109-2216 USA
5. Department of Chemistry; Colorado State University; 1301 Center Avenue Fort Collins CO 80523 USA