1. Faculty of Sciences, Chemistry Laboratory, University of Douala, Douala, Cameroon
2. H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences (ICCBS) University of Karachi, Karachi, Pakistan
3. Multidisciplinary Research Lab, Bahria University Medical and Dental College, Karachi, Pakistan
4. Jodrell Laboratory, Natural Capital and Plant Health Department, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3DS, United Kingdom
5. Department of Chemistry Inorganic and Structural Chemistry, Bielefeld University, Bielefeld, Germany
6. Department of Chemistry, Higher Teacher Training College University of Yaoundé, Yaounde, Cameroon
7. Organic and Bioorganic Chemistry Department of Chemistry, Bielefeld University, Bielefeld, Germany