1. Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030, United States
2. Duke University, Durham, North Carolina 27708, United States
3. In Vitro Science Department, Merck Research Laboratories, West Point, Pennsylvania 19486, United States
4. Structural Chemistry, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States