1. Department of Chemistry and Biochemistry, Mount Allison University, Sackville, NB E4L 1G8, Canada.
2. Department of Biology, University of New Brunswick, Saint John, NB E2L 4L5, Canada.
3. Department of Chemistry, University of New Brunswick, Fredericton, NB E3B 5A3, Canada.
4. Department of Chemistry, St. Mary’s University, Halifax, NS B3H 3C3, Canada.