1. Computational Chemistry Group; Department of Chemistry; Faculty of Science; University of Mauritius; Réduit 80837 Mauritius
2. School of Chemistry; University of Southampton, Highfield; Southampton SO17 1BJ UK
3. Department of Applied Biology and Chemical Technology; The Hong Kong Polytechnic University, Hung Hom; Kowloon Hong Kong
4. Department of Pharmaceutical Chemistry; College of Pharmacy; King Saud University, P.O. Box 2457; Riyadh 11451 Saudi Arabia