1. Department of Chemistry, the University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
2. The Centre of Advanced Materials and Biomaterials Research, the University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
3. Laboratoire de Biochimie Théorique UPR 9080, CNRS and Université de Paris, Paris 75005, France
4. Department of Physics and Astronomy, the University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3K7, Canada