1. Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
2. Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York 10461, United States
3. Department of Molecular Biology and Biochemistry, University of California, Irvine, California 92697-3900, United States
4. Department of Chemistry, University of California, Irvine, California 92697-3900, United States
5. Department of Pharmaceutical Sciences, University of California, Irvine, California 92697-3900, United States