1. School of Pharmacy, Walailak University, Nakhon Si Thammarat, Thailand
2. Drug and Cosmetic Excellence Center, Walailak University, Nakhon Si Thammarat, Thailand
3. School of Allied Health Sciences, Walailak University, Nakhon Si Thammarat, Thailand
4. Center of Excellence in Natural Products Chemistry (CENP), Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
5. National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani, Thailand
6. Department of Bacteriology, Graduate School of Medicine Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan