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Chemical identification of Huashi Baidu decoction (Q-14) using ultrahigh-performance liquid chromatography with quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF/MS). (A) The chemical base peak ion (BPI) chromatogram of Q-14 in the negative ion mode. (B) The BPI chromatogram of Q-14 in the positive ion mode. (C) Structural classification of compounds contained in Q-14. (D) The number of chemical components for each herb.
