1. Natural Products Research Unit, Department of Chemistry, Faculty of Science, Centre of Excellence for Innovation in Chemistry (PERCH-CIC), Khon Kaen University, Khon Kaen 40002, Thailand
2. Department of Microbiology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
3. Department of Biology, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand