1. Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
2. Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
3. Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078, United States
4. Department of Medicine, Division of Respiratory Medicine, University of British Columbia, Vancouver, British Columbia V5Z 1M9, Canada
5. Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada