1. Department of Pharmacology and Pharmacognosy, School of Pharmacy and Health Sciences, United States International University-Africa, 14634-00800, Nairobi, Kenya
2. Department of Pharmacology and Pharmacognosy, College of Health Sciences, University of Nairobi, 14634-00800, Nairobi, Kenya
3. Department of Chemistry, University of Nairobi, 30197-00100, Nairobi, Kenya
4. Centre for Virus Research, Kenya Medical Research Institute, 54628-00200, Nairobi, Kenya
5. Sigowet-Soin Sub-County Hospital, Sondu-Kapsoit Road, Sigowet, Kericho County, 112-20200, Kericho, Kenya
6. Royal Botanic Gardens, Kew, Kew Green, Richmond, Surrey, TW9 3AE, U.K.