1. Institute of Natural MedicineUniversity of Toyama, 2630-Sugitani Toyama 930-0194 Japan
2. Department of ChemistryUniversity of Yangon Yangon 11041 Myanmar
3. Faculty of PharmacyOsaka Ohtani University, 3-11-1 Nisikiori-kita, Tondabayashi Osaka 584-8540 Japan
4. Faculty of Pharmaceutical SciencesTokushima Bunri University, Yamashiro-cho Tokushima 770-8514 Japan
5. Graduate School of Pharmaceutical SciencesThe University of Tokyo, 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
6. Collaborative Research Institute for Innovative MicrobiologyThe University of Tokyo, Yayoi 1-1-1, Bunkyo-ku Tokyo 113-8657 Japan