1. Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794
2. Department of Applied Mathematics and Statistics, State University of New York at Stony Brook, Stony Brook, New York 11794
3. Department of Chemistry, Franklin and Marshall College, Lancaster, Pennsylvania 17603
4. Institute of Chemical Biology and Drug Discovery at State University of New York at Stony Brook, Stony Brook, New York 11794