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Detection and quantification of butyrolactone I from an intracellular fraction of unsupplemented A. terreus culture at 48 h post inoculation. Extracted ion chromatograms of the four main transitions of m/z 425.2: m/z (a) 307; (b) 331; (c) 363 and (d) 393 are shown and were used for quantification of butyrolactone I in this study.
