1. Department of Physics and Astronomy, Brigham Young University, N233 ESC P.O. Box 24658, Provo, Utah 84602-4658, Departments of Medicinal Chemistry and of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, 30 South 2000 East, Room 201, Salt Lake City, Utah 84112-5820, Karolinska Institutet Department of Biosciences at NOVUM Center for Structural Biochemistry, S-141 57 Huddinge, Sweden and Institute for Crystallography, Free University of Berlin, Takustr. 6 D-14195 Berlin, Germany, and...