1. Department of ChemistryTokyo Institute of Technology 2-12-1 O-okayama, Meguro Tokyo 152-8551 Japan
2. Faculty of Pharmaceutical SciencesTokushima Bunri University 180 Nishihama Yamashiro-cho Tokushima 770-8514 Japan
3. School of PharmacyTokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi, Hachioji Tokyo 192-0392 Japan