1. Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim, Perak, Malaysia
2. Department of Pure and Industrial Chemistry, Faculty Natural and Applied Science, Umaru Musa Yar’adua University, Katsina, Nigeria
3. Atta-ur-Rahman Institute for Natural Product Discovery (AuRIns), Universiti Teknologi MARA, Selangor, Malaysia
4. Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia