1. School of Pharmacy Walailak University Thaiburi, Thasala Nakhon Si Thammarat 80160 Thailand
2. Department of Pharmacognosy, Graduate School of Pharmaceutical Sciences Kyushu University Fukuoka 812‐8582 Japan
3. Faculty of Pharmaceutical Sciences Khon Kaen University Khon Kaen 40002 Thailand
4. Research Group for Pharmaceutical Activities of Natural Products Using Pharmaceutical Biotechnology (PANPB) National Research University‐Khon Kaen University Khon Kaen 40002 Thailand
5. Department of Pharmacognosy and Kampo, Faculty of Pharmaceutical Sciences Sanyo‐Onoda City University 1‐1‐1 Daigaku‐Dori Sanyo‐Onoda City Yamaguchi 756‐0884 Japan