1. Department of Chemistry & Biochemistry and School of Biomedical Sciences Kent State University Kent OH 44240 USA
2. State Key Laboratory of Medicinal Chemical Biology Nankai University Tianjin 300071 China
3. Department of Biotechnology and Life Science Faculty of Technology Tokyo University of Agriculture and Technology (TUAT) Koganei Tokyo 184-8588 Japan
4. Department of Chemistry Graduate School of Science Kyoto University Kitashirakawa-oiwakecho, Sakyo-ku Kyoto 606-8502 Japan
5. Institute for Integrated Cell Material Sciences (iCeMS) Kyoto University Yoshida-ushinomiyacho, Sakyo-ku Kyoto 606-8501 Japan