1. School of Life Science, Liaoning University, Shenyang 110036, China
2. Research Center for Computer Simulating and Information Processing of Bio-macromolecules of Liaoning Province, Shenyang 110036, China
3. Engineering Laboratory for Molecular Simulation and Designing of Drug Molecules of Liaoning, Shenyang 110036, China
4. School of Mathematics, Liaoning University, Shenyang 110036, China