1. Key Laboratory for the Chemistry and Molecular Engineering of, Medicinal Resources, School of Chemistry and Pharmaceutical Sciences; Guangxi Normal University; Guilin 541004 P. R. China
2. Key Laboratory for the Synthesis and Application of, Organic Functional Molecules, College of Chemistry and Chemical Engineering; Hubei University; Wuhan 430062 P. R. China
3. College of Chemistry and Chemical Engineering, Shanxi University of Science and Technology; Xi'an 710021 P. R. China
4. Universite de Strasbourg, Institut de Chimie de Strasbourg, CNRS-UMR7177; 4 rue Blaise Pascal Strasbourg Cedex 67070 France