1. Department of Pharmacognosy and Pharmaceutical Botany, Prince of Songkla University, Hat-Yai, Songkhla, Thailand;
2. Department of Pharmacognosy, Graduate School of Biomedical Sciences, Hiroshima University, Minamiku, Hiroshima, Japan;
3. Excellent Research Laboratory, Phytomedicine and Pharmaceutical Biotechnology Excellence Center, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat-Yai, Songkhla, Thailand