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HPLC-MS analysis of cereulide and valinomycin. (a) HPLC chromatogram (500 to 1,300 m/z) showing separation of cereulide and valinomycin. (b) Mass spectrum of valinomycin. (c) Mass spectrum of cereulide. (d) Calibration curve for valinomycin determined from four injections of two separate dilution series.
