1. Department of Pharmaceutical Health Chemistry, Faculty of Pharmaceutical Sciences, Tokushima University, Shomach-1, Tokushima 770-8505, Japan
2. Department of Environmental Biochemistry, Kyoto Pharmaceutical University, Yamashina, Kyoto 607-8414, Japan
3. Department of Medicinal Chemistry, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan
4. Department of Pharmaceutical Health Chemistry, Graduate School of Biomedical Sciences, Tokushima University, Shomach-1, Tokushima 770-8505, Japan