1. Department of Chemistry, Université de Montréal, Québec, H3C 3J7, Canada
2. Department of Medicinal Chemistry, Ionis Pharmaceuticals, Carlsbad, CA 92010, USA
3. Alnylam Pharmaceuticals, 675 West Kendall St, Cambridge, MA 0214, USA
4. Department of Pharmaceutical Sciences, University of California, Irvine, CA 92697, USA