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Peak fractions were separated on a Spectra System LC using a Kinetex 5μm F5 LC column (150 x 4.6 mm) (Phenomenex). The mass-to-charge ratio (m/z) versus peak intensity was determined. Samples of “peaks (P) 1 to 4” with retention times of 19, 20, 23 and 28 min were used to determine the molecular weights of unknown compounds with m/z 449.9, 447.9, 431.9 and 594.0 Da, respectively.
