1. Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Mahidol University
2. Institute of Science and Technology for Research and Development, Mahidol University
3. Laboratory of Medicinal Chemistry, Chulabhorn Research Institute
4. Department of Pharmaceutical Botany, Faculty of Pharmacy, Mahidol University
5. Natural Product Research Section, Research Division, National Cancer Institute, Thailand
6. Department of Chemistry, Faculty of Science, Mahidol University