1. Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
2. Department of Chemistry, McGill University, Montreal, Quebec H3A 0B8, Canada
3. Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta T6G 2E1, Canada
4. Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada