1. Department of Pharmacognosy and Pharmaceutical Botany, Faculty of Pharmaceutical Sciences; Prince of Songkla University; Hat-Yai Songkhla 90112 Thailand
2. Excellent Research Laboratory, Phytomedicine and Pharmaceutical Biotechnology Excellence Center, Faculty of Pharmaceutical Sciences; Prince of Songkla Univesity; Hat-Yai Songkhla 90112 Thailand
3. Faculty of Oriental Medicine; Rangsit University; Patumthani 12000 Thailand
4. Department of Chemistry, Faculty of Science; Prince of Songkla University; Hat-Yai Songkhla 90112 Thailand