1. Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, International Business Incubator, Guangzhou Science Park, Guangzhou 510663, P. R. China
2. State Key Laboratory of Respiratory Diseases, Guangzhou 510120, P. R. China
3. Laboratoire Charles Friedel, UMR 7223, Ecole Nationale Supérieure de Chimie de Paris, 11, rue P. et M. Curie, 75231 Paris Cedex 05, France