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Base peak chromatogram (BPC) obtained from the high-performance liquid chromatography coupled to diode array detection and electrospray time-of-flight mass spectrometry (HPLC-DAD-ESI-TOF/MS) analysis of the filter cake extracts obtained under different PLE extraction conditions. Peaks have been numbered according to the elution order. For the peak identification, see Table 2. Chromatographic conditions are described in the Experimental Section.
