1. College of Pharmacy, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, Hebei University, Baoding 071002, Hebei, P. R. China
2. Research Center for Advanced Computation, School of Science, Xihua University, Chengdu 610039, P. R. China
3. Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States