1. Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen 40002, Thailand
2. Faculty of Pharmaceutical Sciences, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand
3. Natural Products Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
4. Section of Host Defences, Institute of Natural Medicine, University of Toyama, Toyama 930‑0194, Japan
5. Department of Biochemistry, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
6. Department of English, Faculty of Humanities and Social Sciences, Ubon Ratchathani Rajabhat University, Ubon Ratchathani 34000, Thailand