1. Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany
2. Laboratory of Natural Products and Heterocyclic Synthesis, Department of Organic Chemistry, Faculty of Sciences, University of Yaounde I, Yaounde, Cameroon
3. Institute of Pharmacology and Toxicology, University of Wuerzburg, Wuerzburg, Germany
4. Department of Pharmacy, Faculty of Medicine and Pharmaceutical Sciences, University of Douala, Douala, Cameroon
5. Department of Chemistry, Faculty of Sciences, University of Buea, Buea, Cameroon
6. Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Ferrara, Italy