1. Department of Pharmaceutics, School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, P.R. China;
2. Department of Pharmaceutics, School of Pharmaceutical Sciences, Liaoning University, Shenyang, 110036, P.R. China;
3. Department of Natural Products Chemistry, Key Lab of Chemical Biology (MOE), School of Pharmaceutical Sciences, Shandong University, Jinan, 250012, P.R. China;
4. Research Center for Computer Simulating and Information Processing of Bio-macromolecules of Liaoning Province, Shenyang, 110036, P.R. China