1. Department of Chemistry, Johns Hopkins University, 3400 N. Charles Street, Baltimore, Maryland 21218, United States
2. Division of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, California 92093, United States
3. Department of Regulatory Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
4. Department of Cellular and Molecular Medicine, School of Medicine, University of California, San Diego, La Jolla, California 92093, United States
5. Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States