1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
2. Institute of Surface Analysis and Chemical Biology, University of Jinan, Jinan 250022, P. R. China
3. Department of Chemistry, University of Southern California, Los Angeles, California 90089-0744, United States
4. Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan Minzu University, Kunming 650031, P. R. China
5. Department of Chemistry and Biochemistry, California State University, Los Angeles, California 90032, United States
6. State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China