1. Merck Center for Catalysis at Princeton University, Princeton, New Jersey 08544, United States
2. Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
3. Discovery Chemistry, Merck & Co., Inc., Kenilworth, New Jersey 07033, United States
4. Discovery Chemistry, Merck & Co., Inc., Cambridge, Massachusetts 02141, United States
5. Merck Exploratory Science Center, Merck & Co., Inc., Cambridge, Massachusetts 02141, United States