1. Faculty of Mathematics and Sciences Education, Beijing Institute of Education, Beijing 100120, China
2. Laboratory for Biomolecular Simulation Research, Institute for Quantitative Biomedicine, and Department of Chemistry and Chemical Biology, Rutgers the State University of New Jersey, New Brunswick, New Jersey 08901-8554, United States
3. Department of Chemistry and Chemical Biology, Rutgers the State University of New Jersey, Piscataway, New Jersey 08854-8087, United States
4. Information Technology Office, School of Arts and Sciences, Rutgers the State University of New Jersey, Piscataway, New Jersey 08901, United States