1. Shanghai University of Traditional Chinese Medicine; Shanghai 201203 P. R. China
2. Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian 116023 P. R. China
3. Beijing National Laboratory for Molecular Sciences; National Centre for Mass Spectrometry in Beijing; CAS Key Laboratory of Analytical Chemistry for Living Biosystems; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China