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Identification of chemical compounds in WLS by HPLC. (a) Chromatogram of the mixed standard. (b) Chromatogram of WLS samples (1: ferulic acid; 2: cinnamic acid; 3: cinnamaldehyde; 4: atractylenolide III; 5: alisol C-23-acetate; 6: atractylenolide II; 7: atractylenolide I).
