1. Faculty of Pharmaceutical Sciences, Khon Kaen University , Khon Kaen 40002, Thailand
2. Department of Pharmacognosy, Faculty of Pharmacy, Mahidol University , Bangkok 10400, Thailand
3. Institute of Molecular Biosciences, Mahidol University , Nakhon Pathom 73170, Thailand
4. School of Pharmacy, Walailak University , Nakhon Si Thammarat 80160, Thailand
5. Graduate School of Pharmaceutical Sciences, Kyushu University , Fukuoka 812-8582 , Japan