1. Natural Products Research Unit, Department of Chemistry, and Center for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen, Thailand
2. Department of Chemistry, and Center for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen, Thailand
3. Department of Biochemistry, Faculty of Science, Khon Kaen University, Khon Kaen, Thailand