1. Department of Chemistry and Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University, Evanston, Illinois 60208-3113, Department of Medicinal Chemistry and Pharmacognosy, University of Illinois, Chicago, Illinois 60612-7231, Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana 47907-1333, Department of Biochemistry and Biophysics, University of California, San Francisco, California 94121, and Molecular Biology Division,...