1. Faculty of Science, Department of Chemistry, Center of Excellence in Natural Products Chemistry, Chulalongkorn University, Bangkok, Thailand
2. Faculty of Science and Technology, Department of Chemistry, Thammasat University Lampang Center, Lampang, Thailand
3. Biodiversity and Conservation Research Unit, Walai Rukhavej Botanical Research Institute, Mahasarakham University, Mahasarakham, Thailand
4. Research Division, Natural Products Research Section, National Cancer Institute, Bangkok, Thailand
5. Faculty of Science and Technology, Program of Chemistry, Bansomdejchaopraya Rajabhat University, Bangkok, Thailand