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Ultra performance liquid chromatography (UPLC) chromatogram of the three major compounds identified in B. officinalis flower extract (BFE). (a) UPLC chromatogram of the commercial standard compounds. (b) UPLC chromatogram of the three major compounds in BFE. The chromatograms were obtained at 330 nm (acacetin and luteolin) and 345 nm (apigenin).
