1. Institute
of Natural Medicine, University of Toyama, 2630-Sugitani, Toyama 930-0194, Japan
2. Department
of Chemistry, University of Yangon, Yangon 11041, Myanmar
3. Faculty
of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
4. Graduate
School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan