1. College of Pharmaceutical Sciences, Matsuyama University, Bunkyo-cho, Matsuyama, Ehime 790-8578, Japan
2. Department of Pharmacognosy, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Tsushima, Okayama 700-8530, Japan
3. Okayama University, Okayama 700-8530, Japan