1. Department of Chemistry, City University of New York–Hunter College, New York, New York 10065;
2. Division of Biotechnology and Life Science, Institute of Engineering, Tokyo University of Agriculture and Technology, Tokyo 184-8588, Japan
3. Department of Chemistry, Syracuse University, Syracuse, New York 13244;
4. Department of Biochemistry, Weill Medical College of Cornell University, New York, New York 10021