1. Department of Chemistry, Ahmadu Bello University, Zaria, Nigeria
2. Institute of Organic Chemistry, University of Würzburg, Würzburg, Germany
3. Department of Pharmacognosy, Faculty of Pharmacy, Ain-Shams University, Cairo, Egypt
4. Molecular Signaling & Drug Discovery Laboratory, Department of Biochemistry, Central University of Punjab, Punjab, India
5. Centre National de Floristique, Université d’Abidjan, Conservatoire et Jardin Botanique, Ivory Coast