1. Key Laboratory of Green Chemistry & Technology of Ministry of EducationCollege of ChemistrySichuan University Chengdu 610064 P. R. China
2. School of PharmacySouthwest Medical University Luzhou 646000 P. R. China
3. State Key Laboratory Breeding Base of Green Chemistry-Synthesis TechnologyZhejiang University of Technology Hangzhou 310014 P. R. China
4. State Key Laboratory of Elemento-Organic ChemistryNankai University Tianjin 300071 P. R. China