1. Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
2. Cambria Pharmaceuticals, Cambridge, Massachusetts 02142, United States
3. Geriatric Research Education and Clinical Center, Bedford Veterans Administration Medical Center, Bedford, Massachusetts 01730, United States, and Department of Neurology, Laboratory Medicine and Pathology, and Psychiatry, Boston University School of Medicine, Boston, Massachusetts 02118, United States
4. Department of Molecular Biosciences, Rice Institute for Biomedical Research, Northwestern University, Evanston, Illinois 60208-3500, United States
5. Department of Molecular Biosciences, Chemistry of Life Processes Institute, Center for Molecular Innovation and Drug Discovery, Northwestern University, Evanston, Illinois 60208-3113, United States