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. Hubei Collaborative Innovation Center for Advanced Chemical Materials Ministry of Education Key Laboratory for the Synthesis Application of Organic Functional Molecules College of Chemistry and Chemical Engineering Hubei University Wuhan 430062 P.R. China
3. College of Chemistry and Bioengineering Guilin University of Technology Guilin 541004 P.R. China
4. Institut de Chimie de Strasbourg, CNRS-UMR7177 Université de Strasbourg 4 rue Blaise Pascal Strasbourg 67070 France