1. Department of Chemistry,
School of Arts and Sciences, University of Pennsylvania, 231
South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
2. Skaggs School of Pharmacy and Pharmaceutical
Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
3. Center for
Neurodegenerative Disease Research, Institute on Aging, University of Pennsylvania, 3600 Spruce Street, Philadelphia, Pennsylvania 19104-6323, United States