1. Center of Excellence in Natural Products Chemistry, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
2. Natural Products and Synthesis Chemistry Research Laboratory, Department of Chemistry, Faculty of Science, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia
3. Natural Products Research Section, Research Division, National Cancer Institute, Bangkok 10400, Thailand