1. Graduate School of Biomedical Sciences, Nagasaki University, Bunkyo-machi, Japan
2. Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Japan
3. Department of Chemistry, College of Humanities and Sciences, Nihon University, Setagaya, Tokyo, Japan
4. Department of Chemistry, Rikkyo University, Toshima-ku, Tokyo, Japan
5. Kunming Institute of Botany, Chinese Academy of Science, China