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Detection of either O-monoglucuronosyl-retene-catechols or O-monoglucuronosyl-retene-bis-phenols in human HepG2 cells. (A) Extracted ion chromatogram of Orbitrap full scan at 0 h. (B) Extracted ion chromatogram of Orbitrap full scan at 24 h and MS spectrum of the peak at 17.79 min. The samples were prepared as described in the legend to Figure 1 and were subsequently analyzed on an Orbitrap LC–MS/MS in the negative ion mode.
