1. Department of Chemistry, University of California, 1102 Natural Sciences II, Irvine, California 92697-2025, United States
2. Department of Molecular Biology & Biochemistry, University of California, 3205 McGaugh Hall, Irvine, California 92697-2525, United States
3. Department of Pharmaceutical Sciences, University of California, 101 Theory #100, Irvine, California 92617, United States