1. Department of Chemistry and Biochemistry, Seton Hall University, South Orange, New Jersey 07079, United States
2. Department of Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
3. Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States
4. Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, United States