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Xue Qiao, Jian Han, Man Xu, Zi-chuan Zhang, Shi-feng Sun, Hui-feng Li, Bao-rong Wang, Min Ye, De-an Guo. "Characterization of Chemical Constituents in Guan Xin II Decoction by Liquid Chromatography Coupled with Electrospray Ionization-Mass Spectrometry." Planta Medica 74.14 (2008) 1720-1729