1. Natural Drug Discovery Laboratory, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
2. Faculty of Pharmaceutical Sciences, Hiroshima International University, 5-1-1, Hirokoshingai, Kure, Hiroshima, 737-0112, Japan
3. Graduate School of Innovative Life Science, Department of Bio-functional Molecular Engineering, University of Toyama, Toyama, 930-8555, Japan