1. Department of Clinical Research, Oriental Medicine Research Center of Kitasato University, Tokyo, Japan
2. Division of Biological Chemistry and Biologicals, National Institute of Health Sciences, Tokyo, Japan
3. Department of Pharmacognosy, College of Pharmaceutical Sciences, Matsuyama University, Ehime, Japan
4. Division of Pharmacognosy, Phytochemistry and Narcotics, National Institute of Health Sciences, Tokyo, Japan