1. Centre for Molecular Simulation, University of Calgary, Calgary, AB T2N 1N4, Canada
2. Department of Biological Sciences, University of Calgary, Calgary, AB T2N 1N4, Canada
3. Department of Pharmacology, Addiction Science, and Toxicology, The University of Tennessee Health Science Center, Memphis, TN 38163
4. Department of Pharmaceutical Sciences, School of Pharmacy, Bouvé College of Health Sciences, Northeastern University, Boston, MA 02115
5. Department of Physiology and Biophysics, Virginia Commonwealth University School of Medicine, Richmond, VA 23298
6. Department of Chemistry, University of Illinois at Chicago, Chicago, IL 60607