1. School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun 130117, P. R. China
2. Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chunchon 24341, Korea
3. College of Chemistry, Jilin Normal University, Siping 136000, P. R. China
4. State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, P. R. China