1. Department of Chemistry, University of California, Irvine, California 92697-2025, United States
2. Institute for Therapeutics Discovery and Development, University of Minnesota, Minneapolis, Minnesota 55414, United States
3. SRI International, 333 Ravenswood Avenue, Menlo Park, California 94025, United States
4. Department of Molecular Biology and Biochemistry, University of California, Irvine, California 92697-3900, United States