1. International Scientific and Technological Cooperation Base of Chiral Chemistry, Henan University, Kaifeng, Henan, P. R. China 475004
2. School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, P. R. China 453007
3. Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, Guangdong, P. R. China 524023