We used a validated bioanalytical method using supercritical fluid chromatography coupled with tandem mass spectrometry to quantify MBQ-167 in tumors and tissues, as previously described [26 (link)]. The analysis was performed on an Acquity UPC2 system (Waters Corp., Milford, MA, USA) coupled to a triple quadrupole tandem mass spectrometer (MS/MS). An Acquity UPC2 BEH (3.0 × 100 mm2, 1.7 μm) column was used for separation purposes.
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