1. Department of Chemistry, Tshwane University of Technology, Pretoria, South Africa
2. Computational and Bio-Simulation Research Group, University of Calabar, Calabar, Nigeria
3. Department of Chemistry, University of the Free State, Bloemfontein, South Africa
4. Department of Biological Science, Faculty of Natural and Applied Sciences, Arthur Jarvis University, Akpabuyo, Cross River State, Nigeria