1. Graduate
School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
2. Organisch-Chemisches
Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer
Feld 270, 69120 Heidelberg, Germany
3. Chemistry
Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia