Affiliation: | 1. Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501 Japan;2. Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810 Japan;3. Organisch-Chemisches Institut, Heidelberg University, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany |