1. Department of Pharmacology and Pharmaceutical Sciences, University of Southern California, Los Angeles, CA 90089, USA
2. Department of Molecular Biosciences, University of Kansas, 1200 Sunnyside Avenue, Lawrence, KS 66045, USA
3. School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei 11031, Taiwan
4. The Arnold and Mabel Beckman Laboratory of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California, 91125, USA
5. Department of Plant Pathology, Kansas State University, Manhattan, KS 66506, USA
6. Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA