1. Department of Pure and Industrial Chemistry; University of Nigeria; Nsukka Nigeria
2. Department of Medicinal and Pharmaceutical Chemistry; University of Nigeria; Nsukka Nigeria
3. Skaggs School of Pharmacy and Pharmaceutical Sciences; Center for Discovery and Innovation in Parasitic Diseases; University of California; San Diego 9500 Gilman Drive, PSB 4262, La Jolla, CA 92093 USA