1. Natural
Products Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
2. Sai Gon University, Ho Chi Minh City 748355, Vietnam
3. Natural Products
Research Section, Research Division, National Cancer Institute, Bangkok 10400, Thailand
4. University of Science, National University − Ho Chi Minh City, Ho Chi Minh City 748355, Vietnam