A p -value less than 0.05 was considered statistically significant (*), while a p -value less than 0.01 was considered highly significant (**). 3 Results 3.1 Characterization of chemical compounds in XEASD Representative base peak chromatogram (BPC) of XEASD in the positive ion mode and negative ion mode are shown in Figure 1 .
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Chemical characterization and metabolic profiling of Xiao-Er-An-Shen Decoction by UPLC-QTOF/MS.
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