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Chromatograms of second-round preparative HPLC purification of paeninodin (a) and paeninodin-OPO32− (b) are shown. MS2 spectra of paeninodin (c) and paeninodin-OPO32− (d) are shown. MS3 spectra of y11 fragments of paeninodin (e) and paeninodin-OPO32− (f) are shown.
