1. Department
of Chemistry, The University of Hong Kong, Hong Kong, China
2. Institute
of New Drug Research and Guangdong Province Key Laboratory of Pharmacodynamic
Constituents of Traditional Chinese Medicine, College of Pharmacy, Jinan University, Guangzhou 510632, China
3. Department
of Chemistry and Centre for Research in Mass Spectrometry, York University, Toronto, Ontario M3J 1P3, Canada
4. State
Key Laboratory of Quality Research in Chinese Medicine and Institute
of Chinese Medical Sciences, University of Macau, Avenue Padre
Tomás Pereira S.J., Taipa, Macau 999078, China
5. Department
of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario N9B 3P4, Canada