1. Borough of Manhattan Community College, Department of Science; The City University of New York; New York NY 10007 USA
2. Center for Biophysics and Computational Biology/ICMS, Department of Chemistry; Temple University; Philadelphia PA 19122 USA
3. Skaggs School of Pharmacy and Pharmaceutical Sciences; University of California San Diego; La Jolla CA 92093-0736 USA
4. Department of Chemistry; Lehman College, The City University of New York; Bronx NY 10468 USA
5. Department of Chemistry; Brooklyn College, The City University of New York; Brooklyn NY 11210 USA