1. School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
2. Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, University of Science and Technology Beijing, Beijing 100083, P. R. China
3. Institute of Biotechnology, Daqing Branch of Heilongjiang Academy of Science, Daqing 163319, P. R. China