1. School of Biological Sciences, Universiti Sains Malaysia (USM), Georgetown 11800, Penang, Malaysia
2. Department of Botany, Gombe State University, P.M.B 127, Gombe 760214, Nigeria
3. Centre for Chemical Biology (CCB), Universiti Sains Malaysia (USM), Bayan Lepas 11900, Penang, Malaysia
4. Department of Biology, Faculty of Science and Technology Universitas Airlangga, Surabaya 60115, Indonesia