1. Institute for Computational Molecular Science, Temple University, 1925 North 12th Street, Philadelphia, Pennsylvania 19122-1801, USA
2. Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
3. Modeling and Simulation, Corporate Research and Development, The Procter and Gamble Company, West Chester, Ohio 45069, USA
4. Department of Applied Chemistry, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
5. Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, USA