1. Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
2. Department of Microbiology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
3. Natural Products Center of Excellence, Faculty of Science, Prince of Songkla,University, Hat Yai, Songkhla 90112, Thailand
4. Department of Biochemistry, Faculty of Medicine, Srinkharinwirot University, Bangkok 10110, Thailand