1. Department
of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
2. Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research, Ministry of Education, Key Laboratory of Phytochemical R&D of Hunan Province, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan 410081, China
3. College
of Chemistry, Nankai University, Tianjin, 300071, China