1. Department of Pharmacognosy; Faculty of Pharmacy; Obafemi Awolowo University; Ile Ife; Nigeria
2. Institute of Pharmaceutical Biology and Phytochemistry; Westfälische Wilhelms-Universität; Munster; Germany
3. Department of Pharmacology; Institute of Pharmaceutical and Medicinal Chemistry; Westfälische Wilhelms-Universität; Munster; Germany