1. Faculty of Natural Sciences, Haiphong University, Haiphong City, Vietnam-Haiphong, Viet Nam
2. Faculty of Biology, VNU University of Science -334 Nguyen Trai Str., Thanh Xuan, Hanoi, Vietnam, Hanoi, Viet Nam
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