1. Advanced Center for Bioorganic Chemistry, Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi 844, Vietnam
2. Faculty of Technology, Industrial University of Vinh, Vinh, Vietnam
3. Département de Chimie des Substances Naturelles et Chimie Médicinale, Institut de Chimie des Substances Naturelles, Gif-sur-Yvette Cedex 91190, France