1. Faculty of Chemistry, Vinh University, 182-Le Duan, Vinh, Nghean, Vietnam
2. Faculty of Biology, Vinh University, 182-Le Duan, Vinh, Nghean, Vietnam
3. Natural Products Research Unit, Department of Chemistry, Faculty of Science, Lagos State University, Badagry Expressway Ojo, P.M.B. 0001, Lasu Post Office, Ojo, Lagos, Nigeria