1. Computational and Bio-Simulation Research Group, University of Calabar, Calabar 540221, Nigeria
2. Department of Pure and Applied Chemistry, Faculty of Physical Sciences, University of Calabar, Calabar 540221, Nigeria
3. Department of Mathematics, Faculty of Physical Sciences, University of Calabar, Calabar 540221, Nigeria
4. Department of Chemical Sciences, University of Johannesburg, Johannesburg 2006, South Africa