1. Department of Bioorganic Medicinal Chemistry; Faculty of Life Sciences; Kumamoto University; Chuo-ku 862-0973 Kumamoto Japan
2. Department of Chemistry of Natural Compounds; National Research Center; 12622 Dokki Cairo Egypt
3. Division of Cellular and Molecular Biology; Institute of Medical Science; The University of Tokyo; Minato-ku 108-8639 Tokyo Japan
4. Research Institute for Drug Discovery; School of Pharmacy; Kumamoto University; Chuo-ku 862-0973 Kumamoto Japan