1. Department of Pharmacognosy and Pharmaceutical
Botany, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand
2. Department of Chemistry and Center of Excellence
in Protein Structure and Function, Faculty of Science, Mahidol University, Ratchathevi, Bangkok 10400, Thailand
3. Department of Chemistry, Faculty of Science, Kasetsart University, Chatuchak, Bangkok 10900, Thailand