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The chemical structures and the PRM chromatograms in the negative mode of VEE. The structures and PRM chromatograms of seven compounds in VEE are shown. Hedt-I, Hedt-II, Hedt-III, Hedt-IV, Isor, Tddf, and Pach were identified. UHPLC-Q-Exactive Orbitrap-MS analysis was performed as described in the Materials and Methods section. (A) The chemical structures; (B) PRM chromatograms.
